thread_local appears to be unavailable on ARMV7 iOS

driver/level2/gemv_thread.c

@@ -72,9 +72,9 @@
        defined __BORLANDC__ )
 #  define thread_local __declspec(thread) 
 /* note that ICC (linux) and Clang are covered by __GNUC__ */
-# elif defined __GNUC__ || \
+# elif (defined __GNUC__ || \
        defined __SUNPRO_C || \
-       defined __xlC__
+       defined __xlC__) && !defined(__APPLE__)
 #  define thread_local __thread
 # else
 # define UNSAFE