mksysinfo.sh: Handle TIOCGPGRP if too complex for -dump-go-spec.

    
    Reviewed-on: https://go-review.googlesource.com/16580

From-SVN: r229676

gcc/go/gofrontend/MERGE

-e9550aa81d38ada037f675f50cbc09e6f1c35c12
+3b06572039eb525abfecce15f066ad6ab0fdea05
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/mksysinfo.sh

@@ -183,6 +183,9 @@ enum {
 #ifdef TIOCSCTTY
   TIOCSCTTY_val = TIOCSCTTY,
 #endif
+#ifdef TIOCGPGRP
+  TIOCGPGRP_val = TIOCGPGRP,
+#endif
 #ifdef TIOCSPGRP
   TIOCSPGRP_val = TIOCSPGRP,
 #endif
@@ -920,6 +923,11 @@ if ! grep '^const TIOCSCTTY' ${OUT} >/dev/null 2>&1; then
     echo 'const TIOCSCTTY = _TIOCSCTTY_val' >> ${OUT}
   fi
 fi
+if ! grep '^const TIOCGPGRP' ${OUT} >/dev/null 2>&1; then
+  if grep '^const _TIOCGPGRP_val' ${OUT} >/dev/null 2>&1; then
+    echo 'const TIOCGPGRP = _TIOCGPGRP_val' >> ${OUT}
+  fi
+fi
 if ! grep '^const TIOCSPGRP' ${OUT} >/dev/null 2>&1; then
   if grep '^const _TIOCSPGRP_val' ${OUT} >/dev/null 2>&1; then
     echo 'const TIOCSPGRP = _TIOCSPGRP_val' >> ${OUT}