mali-fbdev support / debian package changes

* mali-fbdev support from https://github.com/mihailescu2m/libsdl2-2.0.2-dfsg1 with changes for newer SDL

cmake/sdlchecks.cmake

@@ -778,6 +778,29 @@ macro(CheckVivante)
   endif(VIDEO_VIVANTE)
 endmacro(CheckVivante)
 
+# Requires:
+# - n/a
+macro(CheckMali)
+  if(VIDEO_MALI)
+    check_c_source_compiles("
+        #define LINUX
+        #define EGL_API_FB
+        #include <EGL/egl.h>
+        int main(int argc, char** argv) {}" HAVE_VIDEO_MALI_EGL_FB)
+    if(HAVE_VIDEO_MALI_EGL_FB)
+      set(HAVE_VIDEO_MALI TRUE)
+      set(HAVE_SDL_VIDEO TRUE)
+
+      file(GLOB MALI_SOURCES ${SDL2_SOURCE_DIR}/src/video/mali-fbdev/*.c)
+      set(SOURCE_FILES ${SOURCE_FILES} ${MALI_SOURCES})
+      set(SDL_VIDEO_DRIVER_MALI 1)
+      set(SDL_CFLAGS "${SDL_CFLAGS} -DLINUX -DEGL_API_FB")
+      list(APPEND EXTRA_LIBS EGL)
+    endif(HAVE_VIDEO_MALI_EGL_MALI)
+  endif(VIDEO_MALI)
+endmacro(CheckMali)
+
+
 # Requires:
 # - nada
 macro(CheckOpenGLX11)