Minor #include cleanup.

I just noticed that libpq's pqsignal.h was violating our general inclusion
style guidelines by explicitly including postgres_fe.h.  Remove that, and
put it in pqsignal.c where it belongs.

src/interfaces/libpq/pqsignal.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/pqsignal.c,v 1.30 2010/01/02 16:58:12 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/pqsignal.c,v 1.31 2010/08/13 20:04:33 tgl Exp $
  *
  * NOTES
  *		This shouldn't be in libpq, but the monitor and some other
@@ -17,10 +17,13 @@
  *
  *-------------------------------------------------------------------------
  */
-#include "pqsignal.h"
+#include "postgres_fe.h"
 
 #include <signal.h>
 
+#include "pqsignal.h"
+
+
 pqsigfunc
 pqsignal(int signo, pqsigfunc func)
 {

src/interfaces/libpq/pqsignal.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/interfaces/libpq/pqsignal.h,v 1.25 2010/01/02 16:58:12 momjian Exp $
+ * $PostgreSQL: pgsql/src/interfaces/libpq/pqsignal.h,v 1.26 2010/08/13 20:04:33 tgl Exp $
  *
  * NOTES
  *	  This shouldn't be in libpq, but the monitor and some other
@@ -18,8 +18,6 @@
 #ifndef PQSIGNAL_H
 #define PQSIGNAL_H
 
-#include "postgres_fe.h"
-
 typedef void (*pqsigfunc) (int);
 
 extern pqsigfunc pqsignal(int signo, pqsigfunc func);