flightgear: fix musl

srcpkgs/flightgear/patches/musl-fix_execinfo_h.patch

@@ -0,0 +1,22 @@
+--- src/Main/bootstrap.cxx	2017-03-17 09:52:07.474706542 +0100
++++ src/Main/bootstrap.cxx	2017-03-17 09:53:40.361793507 +0100
+@@ -141,7 +141,7 @@
+ }
+ #endif
+ 
+-#if defined(__GNUC__)
++#if defined(__GNUC__) && defined(__GLIBC__)
+ #include <execinfo.h>
+ #include <cxxabi.h>
+ void segfault_handler(int signo) {
+@@ -244,8 +244,10 @@
+     
+   signal(SIGPIPE, SIG_IGN);
+ # ifndef NDEBUG
++# ifdef __GLIBC__
+   signal(SIGSEGV, segfault_handler);
+ # endif
++# endif
+ #endif
+ 
+   _bootstrap_OSInit = 0;

srcpkgs/flightgear/patches/musl-fix_feenableexcept.patch

@@ -0,0 +1,11 @@
+--- src/FDM/JSBSim/JSBSim.cpp	2017-03-01 21:06:31.000000000 +0100
++++ src/FDM/JSBSim/JSBSim.cpp	2017-03-17 09:49:13.115544107 +0100
+@@ -287,7 +287,7 @@
+   _clearfp();
+   _controlfp(_controlfp(0, 0) & ~(_EM_INVALID | _EM_ZERODIVIDE | _EM_OVERFLOW),
+            _MCW_EM);
+-#elif defined(__GNUC__) && !defined(sgi) && !defined(__APPLE__)
++#elif defined(__GNUC__) && !defined(sgi) && !defined(__APPLE__) && defined(__GLIBC__)
+   feenableexcept(FE_DIVBYZERO | FE_INVALID);
+ #endif
+