Fixup autogeneration of bits/syscalls.h

libc/sysdeps/linux/mips/Makefile

@@ -73,6 +73,7 @@ $(COBJS): %.o : %.c
 	$(STRIPTOOL) -x -R .note -R .comment $*.o
 
 headers:
+	@(TOPDIR=$(TOPDIR) CC=$(CC) /bin/sh $(TOPDIR)/extra/scripts/gen_bits_syscall_h.sh > bits/syscall.h ) 
 	cd $(TOPDIR)/include;ln -fs ../libc/sysdeps/linux/mipsel/sgidefs.h .
 
 clean: