Merge "Add --sysroot /dev/null to musl compiles" am: e4c400bef5

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1983627

Change-Id: I5e44525140e87cc7b58f7f8c53315a7459f3148c

cc/config/x86_linux_host.go

@@ -47,6 +47,7 @@ var (
 		"-D_LIBCPP_HAS_MUSL_LIBC",
 		"-DANDROID_HOST_MUSL",
 		"-nostdlibinc",
+		"--sysroot /dev/null",
 	}
 
 	linuxLdflags = []string{
@@ -65,6 +66,7 @@ var (
 	linuxMuslLdflags = []string{
 		"-nostdlib",
 		"-lgcc", "-lgcc_eh",
+		"--sysroot /dev/null",
 	}
 
 	// Extended cflags