Remove -isystem frameworks/av/include

Remove the last -isystem for global include directory (besides
bionic).

Bug: 31751828
Test: builds
Change-Id: I8f38332de8f0cffd5c56b9b5ebeacbaaf3a4faea
Merged-In: I8f38332de8f0cffd5c56b9b5ebeacbaaf3a4faea
(cherry picked from commit d13a457a45)

cc/compiler.go

@@ -219,7 +219,6 @@ func (compiler *baseCompiler) compilerFlags(ctx ModuleContext, flags Flags) Flag
 		if !(ctx.sdk() || ctx.vndk()) || ctx.Host() {
 			flags.SystemIncludeFlags = append(flags.SystemIncludeFlags,
 				"${config.CommonGlobalIncludes}",
-				"${config.CommonGlobalSystemIncludes}",
 				tc.IncludeFlags(),
 				"${config.CommonNativehelperInclude}")
 		}