syscall: Fix to libgo/mksysinfo.sh

In a recent change to mksysinfo.sh, a space was missing on
some lines which caused the libgo build to hang on some
systems.  This corrects that problem.

Fixes golang/go#11924

Change-Id: I36ea2a2daaf25c5210c394daae7f2e6888e983e5
Reviewed-on: https://go-review.googlesource.com/12835
Reviewed-by: Ian Lance Taylor <iant@golang.org>

libgo/mksysinfo.sh

@@ -1026,19 +1026,19 @@ if ! grep '^const TUNDETACHFILTER' ${OUT} >/dev/null 2>&1; then
   fi
 fi
 
-if ! grep '^const TUNGETVNETHDRSZ'${OUT} >/dev/null 2>&1; then
+if ! grep '^const TUNGETVNETHDRSZ' ${OUT} >/dev/null 2>&1; then
   if grep '^const _TUNGETVNETHDRSZ_val' ${OUT} >/dev/null 2>&1; then
     echo 'const TUNGETVNETHDRSZ = _TUNGETVNETHDRSZ_val' >> ${OUT}
   fi
 fi
 
-if ! grep '^const TUNSETVNETHDRSZ'${OUT} >/dev/null 2>&1; then
+if ! grep '^const TUNSETVNETHDRSZ' ${OUT} >/dev/null 2>&1; then
   if grep '^const _TUNSETVNETHDRSZ_val' ${OUT} >/dev/null 2>&1; then
     echo 'const TUNSETVNETHDRSZ = _TUNSETVNETHDRSZ_val' >> ${OUT}
   fi
 fi
 
-if ! grep '^const TUNSETQUEUE'${OUT} >/dev/null 2>&1; then
+if ! grep '^const TUNSETQUEUE' ${OUT} >/dev/null 2>&1; then
   if grep '^const _TUNSETQUEUE_val' ${OUT} >/dev/null 2>&1; then
     echo 'const TUNSETQUEUE = _TUNSETQUEUE_val' >> ${OUT}
   fi