Compile android_native_app_glue.c as C

* It doesn't compile as C++ in latest compilers so we can't include it in-line
  in the C++ source

renderdoccmd/renderdoccmd_android.cpp

@@ -33,10 +33,6 @@
 #include <string>
 
 #include <android_native_app_glue.h>
-#define ANativeActivity_onCreate __attribute__((visibility("default"))) ANativeActivity_onCreate
-extern "C" {
-#include <android_native_app_glue.c>
-}
 
 #include <android/log.h>
 #define ANDROID_LOG(...) __android_log_print(ANDROID_LOG_INFO, "renderdoccmd", __VA_ARGS__);