clang: drop gcc dependency.

Instead depend on libgcc-devel and *libc-devel directly.

srcpkgs/llvm/template

@@ -1,7 +1,7 @@
 # Template file for 'llvm'
 pkgname=llvm
 version=3.7.1
-revision=1
+revision=2
 wrksrc="llvm-${version}.src"
 lib32disabled=yes
 configure_args="--disable-expensive-checks --disable-debug-runtime
@@ -158,7 +158,11 @@ clang-analyzer_package() {
 }
 clang_package() {
 	lib32disabled=yes
-	depends="libstdc++-devel binutils gcc"
+	depends="libstdc++-devel libgcc-devel binutils"
+	case "$XBPS_TARGET_MACHINE" in
+		*-musl) depends+=" musl-devel";;
+		*) depends+=" glibc-devel";;
+	esac
 	short_desc+=" - C language family frontend"
 	homepage="http://clang.llvm.org/"
 	pkg_install() {