Fixed Android build with Vulkan support

src/video/SDL_vulkan_internal.h

@@ -25,11 +25,19 @@
 
 #include "SDL_stdinc.h"
 
+#if defined(__ANDROID__) && defined(__ARM_ARCH) && __ARM_ARCH < 7
+/* Vulkan isn't supported for the 'armeabi' NDK ABI, error in vk_platform.h */
+#undef SDL_VIDEO_VULKAN_SURFACE
+#define SDL_VIDEO_VULKAN_SURFACE 0
+#endif
+
 #if defined(SDL_LOADSO_DISABLED)
 #undef SDL_VIDEO_VULKAN_SURFACE
 #define SDL_VIDEO_VULKAN_SURFACE 0
 #endif
 
+#if SDL_VIDEO_VULKAN_SURFACE
+
 #if SDL_VIDEO_DRIVER_ANDROID
 #define VK_USE_PLATFORM_ANDROID_KHR
 #endif
@@ -58,7 +66,6 @@
 
 #include "SDL_vulkan.h"
 
-#if SDL_VIDEO_VULKAN_SURFACE
 
 extern const char *SDL_Vulkan_GetResultString(VkResult result);
 
@@ -72,6 +79,12 @@ extern SDL_bool SDL_Vulkan_GetInstanceExtensions_Helper(unsigned *userCount,
                                                         const char **userNames,
                                                         unsigned nameCount,
                                                         const char *const *names);
+
+#else
+
+/* No SDL Vulkan support, just include the header for typedefs */
+#include "SDL_vulkan.h"
+
 #endif /* SDL_VIDEO_VULKAN_SURFACE */
 
 #endif /* SDL_vulkan_internal_h_ */