Update prebuilt Clang to r416183b from Android.

https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef

clang 12.0.5 (based on r416183b) from build 7284624.

Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/include/llvm/Support/PluginLoader.h b/linux-x64/clang/include/llvm/Support/PluginLoader.h
index c0c516b..95c087f 100644
--- a/linux-x64/clang/include/llvm/Support/PluginLoader.h
+++ b/linux-x64/clang/include/llvm/Support/PluginLoader.h
@@ -16,7 +16,11 @@
 #ifndef LLVM_SUPPORT_PLUGINLOADER_H
 #define LLVM_SUPPORT_PLUGINLOADER_H
 
+#ifndef DONT_GET_PLUGIN_LOADER_OPTION
 #include "llvm/Support/CommandLine.h"
+#endif
+
+#include <string>
 
 namespace llvm {
   struct PluginLoader {