fix: don't use _Float16 type on GCC 12

`_Float16` is not supported by GCC 12 on Arm64 architectures:
https://godbolt.org/z/nKbrjPTvG

Related to:
Homebrew/homebrew-core#263008
Homebrew/homebrew-core#263009

Signed-off-by: botantony <antonsm21@gmail.com>

Author: botantony

openblas_config_template.h

@@ -39,7 +39,7 @@ typedef unsigned long BLASULONG;
 typedef uint16_t bfloat16;
 #endif
 
-#if defined(__GNUC__) && (__GNUC__ >= 12)
+#if defined(__GNUC__) && (__GNUC__ > 12)
 typedef _Float16 hfloat16;
 #else
 #include <stdint.h>