Restore building gdb

[Pedro Alves <pedro@codesourcery.com>]

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One of my previous patches added an unguarded access to
inferior_process_group, which is only defined if
PROCESS_GROUP_TYPE is defined.

#ifdef PROCESS_GROUP_TYPE
/* Process group for us and the inferior.  Saved and restored just like
   {our,inferior}_ttystate.  */
PROCESS_GROUP_TYPE our_process_group;
PROCESS_GROUP_TYPE inferior_process_group;
#endif

This patch should fix it.

-- 
Pedro Alves

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2008-03-19  Pedro Alves  <pedro@codesourcery.com>

	* inflow.c (terminal_ours_1): Guard access to
	inferior_process_group with #ifdef PROCESS_GROUP_TYPE.

---
 gdb/inflow.c |    2 ++
 1 file changed, 2 insertions(+)

Index: src/gdb/inflow.c
===================================================================
--- src.orig/gdb/inflow.c	2008-03-19 14:26:18.000000000 +0000
+++ src/gdb/inflow.c	2008-03-19 14:26:34.000000000 +0000
@@ -350,11 +350,13 @@ terminal_ours_1 (int output_only)
 	xfree (inferior_ttystate);
       inferior_ttystate = serial_get_tty_state (stdin_serial);
 
+#ifdef PROCESS_GROUP_TYPE
       if (!attach_flag)
 	/* If setpgrp failed in terminal_inferior, this would give us
 	   our process group instead of the inferior's.  See
 	   terminal_inferior for details.  */
 	inferior_process_group = gdb_getpgrp ();
+#endif
 
       /* Here we used to set ICANON in our ttystate, but I believe this
          was an artifact from before when we used readline.  Readline sets