atomic: Patched to compile on Android.
diff --git a/src/atomic/SDL_atomic.c b/src/atomic/SDL_atomic.c
index 3ae7647..28c25ae 100644
--- a/src/atomic/SDL_atomic.c
+++ b/src/atomic/SDL_atomic.c
@@ -39,7 +39,11 @@
#if defined(HAVE_GCC_ATOMICS)
# if defined(__clang__)
# if __has_builtin(__atomic_load_n)
-# define HAVE_ATOMIC_LOAD_N 1
+ /* !!! FIXME: this advertises as available in the NDK but uses an external symbol we don't have.
+ It might be in a later NDK or we might need an extra library? --ryan. */
+# if !defined(__ANDROID__)
+# define HAVE_ATOMIC_LOAD_N 1
+# endif
# endif
# elif defined(__GNUC__)
# if (__GNUC__ >= 5)
