.gnu_attribute requires binutils 2.18

--- src/host/buildvm_asm.c.orig	Tue May  2 04:11:00 2017
+++ src/host/buildvm_asm.c	Tue May  2 11:40:27 2017
@@ -290,12 +290,14 @@ void emit_asm(BuildCtx *ctx)
 #if !(LJ_TARGET_PS3 || LJ_TARGET_PSVITA)
     fprintf(ctx->fp, "\t.section .note.GNU-stack,\"\"," ELFASM_PX "progbits\n");
 #endif
+#if 0
 #if LJ_TARGET_PPCSPE
     /* Soft-float ABI + SPE. */
     fprintf(ctx->fp, "\t.gnu_attribute 4, 2\n\t.gnu_attribute 8, 3\n");
 #elif LJ_TARGET_PPC && !LJ_TARGET_PS3
     /* Hard-float ABI. */
     fprintf(ctx->fp, "\t.gnu_attribute 4, 1\n");
+#endif
 #endif
     /* fallthrough */
   case BUILD_coffasm: