sqrtf.c OK (#257)

* sqrtf OK

* spec

* format

* Move to libultra

src/libultra/gu/sqrtf.c

@@ -1,3 +1,9 @@
 #include "global.h"
 
-#pragma GLOBAL_ASM("asm/non_matchings/boot/sqrtf/sqrtf.s")
+#ifndef __GNUC__
+#define __builtin_sqrtf sqrtf
+#endif
+
+f32 sqrtf(f32 f) {
+    return __builtin_sqrtf(f);
+}