Fix mac art build

-Wl,-read_only_relocs,suppress is required for libart to build to
avoid the error:
ld: illegal text-relocation to '__ZN3art7Runtime9instance_E' in out/soong/.intermediates/art/runtime/libart/darwin_x86_static/obj/art/runtime/runtime.o from '_art_quick_throw_null_pointer_exception' in out/soong/.intermediates/art/runtime/libart/darwin_x86_static/obj/art/runtime/arch/x86/quick_entrypoints_x86.o for architecture i386

Change-Id: Id9a0fda1dbf12a254f92419a21e5f290895ea62c
diff --git a/cc/library.go b/cc/library.go
index ad1822d..5119c90 100644
--- a/cc/library.go
+++ b/cc/library.go
@@ -215,7 +215,7 @@
 			f = append(f,
 				"-dynamiclib",
 				"-single_module",
-				//"-read_only_relocs suppress",
+				"-read_only_relocs suppress",
 				"-install_name @rpath/"+libName+flags.Toolchain.ShlibSuffix(),
 			)
 		} else {