Remove s/aix4-2.h

* configure.ac (opsysfile): Set to empty on aix4-2.

* src/s/aix4-2.h: Remove empty file.

ChangeLog

@@ -2,8 +2,8 @@
 
 	* configure.ac (opsysfile): Tweak message for null case.
 
-	* configure.ac (opsysfile): Set to empty on freebsd, gnu-linux,
-	gnu-kfreebsd; and to usg5-4-common.h on sol2*, unixware.
+	* configure.ac (opsysfile): Set to empty on aix4-2, freebsd,
+	gnu-linux, gnu-kfreebsd; and to usg5-4-common.h on sol2*, unixware.
 
 2012-07-30  Paul Eggert  <eggert@cs.ucla.edu>
 

configure.ac

@@ -3650,6 +3650,7 @@ AH_TEMPLATE(USG5, [Define if the system is compatible with System V.])
 
 case $opsys in
   aix4-2)
+    opsysfile=
     AC_DEFINE(USG, [])
     AC_DEFINE(USG5, [])
     dnl This symbol should be defined on AIX Version 3  ???????

src/ChangeLog

@@ -1,7 +1,7 @@
 2012-07-30  Glenn Morris  <rgm@gnu.org>
 
 	* s/aix4-2.h (sigmask): No need to undefine it, since syssignal.h
-	does that unconditionally.
+	does that unconditionally.  Remove file, which is now empty.
 
 	* s/freebsd.h, s/gnu-linux.h, s/sol2-6.h, s/unixware.h:
 	Remove empty files.

src/s/aix4-2.h

@@ -1,18 +0,0 @@
-/*
-Copyright (C) 1999, 2001-2012  Free Software Foundation, Inc.
-
-This file is part of GNU Emacs.
-
-GNU Emacs is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-GNU Emacs is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
-