libGL: rebuild against libllvm.so.6

srcpkgs/libGL/patches/use-new-llvm-flag-api.patch

@@ -0,0 +1,22 @@
+Source: Upstream
+Upstream: 5d61fa4e68b7eb6d481a37efdbb35fdce675a6ad
+Reason: Fixes compilation with llvm6
+
+--- src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
++++ src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+@@ -830,7 +830,11 @@ lp_create_builder(LLVMContextRef ctx, enum lp_float_mode float_mode)
+       llvm::unwrap(builder)->setFastMathFlags(flags);
+       break;
+    case LP_FLOAT_MODE_UNSAFE_FP_MATH:
++#if HAVE_LLVM >= 0x0600
++      flags.setFast();
++#else
+       flags.setUnsafeAlgebra();
++#endif
+       llvm::unwrap(builder)->setFastMathFlags(flags);
+       break;
+    }
+-- 
+cgit v1.1
+
+

srcpkgs/libGL/template

@@ -1,7 +1,7 @@
 # Template build file for 'libGL'.
 pkgname=libGL
 version=17.3.3
-revision=2
+revision=3
 wrksrc="mesa-${version}"
 build_style=gnu-configure
 configure_args="--enable-shared-glapi --enable-gbm