qt5: request stack size on newer musl systems by LDFLAGS

since 1.1.21 musl supports reading the minimal stack size from the
PT_GNU_STACK elf header[1].

[1] https://git.musl-libc.org/cgit/musl/commit/?id=7b3348a98c139b4b4238384e52d4b0eb237e4833

srcpkgs/qt5/patches/0019-musl-v8-thread-stacksize.patch

@@ -1,32 +0,0 @@
---- qtwebengine/src/3rdparty/chromium/ppapi/utility/threading/simple_thread.cc.orig	2018-09-19 13:42:22.591109990 +0200
-+++ qtwebengine/src/3rdparty/chromium/ppapi/utility/threading/simple_thread.cc	2018-09-19 13:43:38.538113908 +0200
-@@ -12,11 +12,15 @@
- 
- namespace {
- 
--// Use 2MB default stack size for Native Client, otherwise use system default.
- #if defined(__native_client__)
-+// Use 2MB default stack size for Native Client
- const size_t kDefaultStackSize = 2 * 1024 * 1024;
--#else
-+#elif defined(__GLIBC__)
-+// Use system default for Gnu libc
- const size_t kDefaultStackSize = 0;
-+#else
-+// Use 2MB default stack size for Musl libc
-+const size_t kDefaultStackSize = 2 * 1024 * 1024;
- #endif
- 
- 
---- qtwebengine/src/3rdparty/chromium/v8/src/base/platform/platform-posix.cc.orig	2018-09-23 17:42:44.130455819 +0200
-+++ qtwebengine/src/3rdparty/chromium/v8/src/base/platform/platform-posix.cc	2018-09-23 17:43:35.195452776 +0200
-@@ -732,6 +732,9 @@
-     // Default on AIX is 96kB -- bump up to 2MB
-     stack_size = 2 * 1024 * 1024;
- #endif
-+#if !defined(__GLIBC__)
-+    stack_size = 2 * 1024 * 1024;
-+#endif
-   }
-   if (stack_size > 0) {
-     result = pthread_attr_setstacksize(&attr, stack_size);

srcpkgs/qt5/patches/0024-musl-mesa-gallium-thread-stacksize.patch

@@ -1,20 +0,0 @@
---- qtwebengine/src/3rdparty/chromium/third_party/mesa/src/src/gallium/auxiliary/os/os_thread.h.orig	2018-09-19 17:15:54.558770949 +0200
-+++ qtwebengine/src/3rdparty/chromium/third_party/mesa/src/src/gallium/auxiliary/os/os_thread.h	2018-09-19 17:22:16.914790675 +0200
-@@ -62,6 +62,16 @@
- 
-    sigfillset(&new_set);
-    pthread_sigmask(SIG_SETMASK, &new_set, &saved_set);
-+
-+   pthread_attr_t attr;
-+   pthread_attr_init(&attr);
-+#if !defined(__GLIBC__)
-+   /* For Musl libc set a thread stack size of 2 MiB */
-+   ret = pthread_attr_setstacksize(&attr, 2 * 1024 * 1024);
-+   if (ret)
-+      return 0;
-+#endif
-+
--   ret = pthread_create( &thread, NULL, routine, param );
-+   ret = pthread_create( &thread, &attr, routine, param );
-    pthread_sigmask(SIG_SETMASK, &saved_set, NULL);
-    if (ret)

srcpkgs/qt5/patches/0030-qtscript-fastmalloc-stacksize.patch

@@ -1,16 +0,0 @@
---- qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp	2018-10-07 21:25:14.377211462 +0200
-+++ qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp	2018-10-07 21:26:13.987214537 +0200
-@@ -1456,7 +1456,12 @@
-   pthread_cond_init(&m_scavengeCondition, 0);
-   m_scavengeThreadActive = true;
-   pthread_t thread;
-+  pthread_attr_t attr;
-+  pthread_attr_init(&attr);
-+#if !defined(__GLIBC__)
-+  pthread_attr_setstacksize(&attr, 2 * 1024 * 1024);
-+#endif
--  pthread_create(&thread, 0, runScavengerThread, this);
-+  pthread_create(&thread, &attr, runScavengerThread, this);
- }
- 
- void* TCMalloc_PageHeap::runScavengerThread(void* context)

srcpkgs/qt5/patches/0031-qtscript-threading-stacksize.patch

@@ -1,31 +0,0 @@
---- qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/ThreadingPthreads.cpp.orig	2018-10-07 21:27:22.340218063 +0200
-+++ qtscript/src/3rdparty/javascriptcore/JavaScriptCore/wtf/ThreadingPthreads.cpp	2018-10-07 21:29:30.743224688 +0200
-@@ -168,8 +168,12 @@
-     ThreadData* threadData = new ThreadData();
-     threadData->entryPoint = entryPoint;
-     threadData->arg = data;
--
--    if (pthread_create(&threadHandle, 0, runThreadWithRegistration, static_cast<void*>(threadData))) {
-+    pthread_attr_t attr;
-+    pthread_attr_init(&attr);
-+#if !defined(__GLIBC__)
-+    pthread_attr_setstacksize(&attr, 2 * 1024 * 1024);
-+#endif
-+    if (pthread_create(&threadHandle, &attr, runThreadWithRegistration, static_cast<void*>(threadData))) {
-         LOG_ERROR("Failed to create pthread at entry point %p with data %p", entryPoint, data);
-         delete threadData;
-         return 0;
-@@ -180,7 +184,12 @@
- ThreadIdentifier createThreadInternal(ThreadFunction entryPoint, void* data, const char*)
- {
-     pthread_t threadHandle;
--    if (pthread_create(&threadHandle, 0, entryPoint, data)) {
-+    pthread_attr_t attr;
-+    pthread_attr_init(&attr);
-+#if !defined(__GLIBC__)
-+    pthread_attr_setstacksize(&attr, 2 * 1024 * 1024);
-+#endif
-+    if (pthread_create(&threadHandle, &attr, entryPoint, data)) {
-         LOG_ERROR("Failed to create pthread at entry point %p with data %p", entryPoint, data);
-         return 0;
-     }

srcpkgs/qt5/template

@@ -1,7 +1,7 @@
 # Template file for 'qt5'
 pkgname=qt5
 version=5.11.3
-revision=3
+revision=4
 wrksrc="qt-everywhere-src-${version}"
 build_style=gnu-configure
 hostmakedepends="cmake clang flex git glib-devel gperf ninja pkg-config
@@ -64,7 +64,7 @@ fi
 CFLAGS="-DOPENSSL_NO_PSK -DOPENSSL_NO_NEXTPROTONEG"
 CXXFLAGS="${CFLAGS} -Wno-deprecated-declarations -Wno-class-memaccess -Wno-packed-not-aligned"
 # Required for musl libc
-LDFLAGS="-pthread -ldl -fPIE"
+LDFLAGS="-pthread -ldl -fPIE -Wl,-z,stack-size=2097152"
 
 if [ "$CROSS_BUILD" ]; then
 	# Need some devel packages in the host to build qmake, moc, uic, rcc