[X11] Reconcile logical keyboard state with physical state on FocusIn

since the window system doesn't do it for us like other platforms.

This prevents sticky keys and missed keys when going in and out
of focus, for example Alt would appear to stick if switching away
from an SDL app with Alt-Tab and had to be pressed again.

CR: Sam

src/main/android/SDL_android_main.c

@@ -0,0 +1,45 @@
+/*
+    SDL_android_main.c, placed in the public domain by Sam Lantinga  3/13/14
+*/
+#include "../../SDL_internal.h"
+
+#ifdef __ANDROID__
+
+/* Include the SDL main definition header */
+#include "SDL_main.h"
+
+/*******************************************************************************
+                 Functions called by JNI
+*******************************************************************************/
+#include <jni.h>
+
+/* Called before SDL_main() to initialize JNI bindings in SDL library */
+extern void SDL_Android_Init(JNIEnv* env, jclass cls);
+
+/* Start up the SDL app */
+int Java_org_libsdl_app_SDLActivity_nativeInit(JNIEnv* env, jclass cls, jobject obj)
+{
+    /* This interface could expand with ABI negotiation, calbacks, etc. */
+    SDL_Android_Init(env, cls);
+
+    SDL_SetMainReady();
+
+    /* Run the application code! */
+    /* Use the name "app_process" so PHYSFS_platformCalcBaseDir() works.
+       https://bitbucket.org/MartinFelis/love-android-sdl2/issue/23/release-build-crash-on-start
+     */
+    int status;
+    char *argv[2];
+    argv[0] = SDL_strdup("app_process");
+    argv[1] = NULL;
+    status = SDL_main(1, argv);
+
+    /* Do not issue an exit or the whole application will terminate instead of just the SDL thread */
+    /* exit(status); */
+
+    return status;
+}
+
+#endif /* __ANDROID__ */
+
+/* vi: set ts=4 sw=4 expandtab: */