turbovnc: unbreak musl again

srcpkgs/turbovnc/patches/musl-asm_page.patch

@@ -0,0 +1,13 @@
+Try to include <asm/page.h> only if __GLIBC__ is defined also.
+
+--- unix/Xvnc/programs/Xserver/Xext/xf86bigfont.c	2014-07-20 02:45:59.000000000 +0200
++++ unix/Xvnc/programs/Xserver/Xext/xf86bigfont.c	2015-09-01 10:28:30.171432632 +0200
+@@ -40,7 +40,7 @@
+ 
+ #include <sys/types.h>
+ #ifdef HAS_SHM
+-#if defined(linux) && (!defined(__GNU_LIBRARY__) || __GNU_LIBRARY__ < 2)
++#if defined(linux) && (!defined(__GNU_LIBRARY__) || __GNU_LIBRARY__ < 2) && defined(__GLIBC__)
+ /* libc4 does not define __GNU_LIBRARY__, libc5 defines __GNU_LIBRARY__ as 1 */
+ /* Linux libc4 and libc5 only (because glibc doesn't include kernel headers):
+    Linux 2.0.x and 2.2.x define SHMLBA as PAGE_SIZE, but forget to define

srcpkgs/turbovnc/template

@@ -1,7 +1,7 @@
 # Template file for 'turbovnc'
 pkgname=turbovnc
 version=2.0
-revision=2
+revision=3
 build_style=cmake
 configure_args="-DTJPEG_LIBRARY=/usr/lib/libturbojpeg.so -DTVNC_CONFDIR=/etc
  -DTVNC_MANDIR=/usr/share/man -DTVNC_DOCDIR=/usr/share/doc/${pkgname} -DTVNC_BUILDJAVA=0"
@@ -14,11 +14,13 @@ license="GPL-2"
 homepage="http://virtualgl.org"
 distfiles="${SOURCEFORGE_SITE}/turbovnc/$pkgname-$version.tar.gz"
 checksum=703c5b9c0da760935eec33b5f883477b40ea212f207529908f67b568dd41d8d6
-only_for_archs="i686 x86_64"
+only_for_archs="i686 i686-musl x86_64 x86_64-musl"
 conflicts="tigervnc>=0"
 
 case "$XBPS_TARGET_MACHINE" in
-	*-musl) broken="http://build.voidlinux.eu/builders/x86_64-musl_builder/builds/4546/steps/shell_3/logs/stdio"
+	*-musl)	# Need this to make <sys/socket.h> define struct ucred
+		CFLAGS="-D_GNU_SOURCE"
+		;;
 esac
 
 post_install() {