libmvec: further unifdef'ing (LIBMVEC_SO_BUILD)

@@ -27,15 +27,13 @@
  */
 
         .file   "__vlog_ultra3.S"
 
 #include "libm.h"
-#if defined(LIBMVEC_SO_BUILD)
         .weak   __vlog
         .type   __vlog,#function
         __vlog = __vlog_ultra3
-#endif
 
 /*
  * ELEVENBIT table and order 5 POLYNOMIAL no explicit correction t
  */