Android: Removed all unnecessary dependencies on C++.

C++ is a bit of a minefield on Android. Much functionality still doesn't work, and Android can't decide on which C++ standard library to use, so it provides 3 different ones, all of which are incompatible with each other. (It looks like clang is coming too which will add a new compiler and a 4th standard library.)

As middleware, SDL might be distributed as a binary and intermixed with other projects already using C++. If C++ is intermixed in a bad way, bad things will happen. Removing dependencies on C++ will avoid this problem and downstream users won't have to worry/care.

Android.mk

@@ -22,7 +22,7 @@ LOCAL_SRC_FILES := \
 	$(wildcard $(LOCAL_PATH)/src/audio/dummy/*.c) \
 	$(LOCAL_PATH)/src/atomic/SDL_atomic.c \
 	$(LOCAL_PATH)/src/atomic/SDL_spinlock.c.arm \
-	$(wildcard $(LOCAL_PATH)/src/core/android/*.cpp) \
+	$(wildcard $(LOCAL_PATH)/src/core/android/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/cpuinfo/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/events/*.c) \
 	$(wildcard $(LOCAL_PATH)/src/file/*.c) \

README-android.txt

@@ -28,10 +28,10 @@ android-project/src/org/libsdl/app/SDLActivity.java
 
 The Java code loads your game code, the SDL shared library, and
 dispatches to native functions implemented in the SDL library:
-src/SDL_android.cpp
+src/SDL_android.c
 
 Your project must include some glue code that starts your main() routine:
-src/main/android/SDL_android_main.cpp
+src/main/android/SDL_android_main.c
 
 
 ================================================================================

android-project/jni/src/Android.mk

@@ -9,7 +9,7 @@ SDL_PATH := ../SDL
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/$(SDL_PATH)/include
 
 # Add your application source files here...
-LOCAL_SRC_FILES := $(SDL_PATH)/src/main/android/SDL_android_main.cpp \
+LOCAL_SRC_FILES := $(SDL_PATH)/src/main/android/SDL_android_main.c \
 	YourSourceHere.c
 
 LOCAL_SHARED_LIBRARIES := SDL2