Merge pull request #5770 from martin-frbg/undef_prefsize

Undefine GEMM_PREFERRED_SIZE before redefining to silence warning

Author: martin-frbg

driver/level3/level3_thread.c

@@ -48,6 +48,7 @@
 #endif
 
 #ifdef DYNAMIC_ARCH
+#undef GEMM_PREFERRED_SIZE
 #define GEMM_PREFERRED_SIZE gotoblas->preferred_size
 #endif
 #ifndef GEMM_PREFERRED_SIZE