libGL: rebuild with llvm using the CXX11 ABI

Signed-off-by: Jürgen Buchmüller <pullmoll@t-online.de>

srcpkgs/libGL/template

@@ -1,7 +1,7 @@
 # Template file for 'libGL'
 pkgname=libGL
 version=18.1.4
-revision=3
+revision=4
 wrksrc="mesa-${version}"
 build_style=gnu-configure
 configure_args="--enable-shared-glapi --enable-gbm
@@ -64,8 +64,6 @@ armv[5-6]*)
 	;;
 esac
 
-CXXFLAGS+=" -D_GLIBCXX_USE_CXX11_ABI=0"
-
 # -devel must be the last one for proper order.
 subpackages+=" MesaLib-devel"