Rename configure.in -> configure.ac

MANIFEST

@@ -102,7 +102,7 @@ config.guess
 config.h.in
 config.sub
 configure
-configure.in
+configure.ac
 doc/CONTRIBUTORS
 doc/HISTORY
 doc/LICENSE

Makefile.in

@@ -181,7 +181,7 @@ update-pot:
 			echo "syntax error" > confstr.sh; \
 			sed -n -e 's/^badpass_message="/gettext "/p' \
 			    -e 's/^passprompt="/gettext "/p' \
-			    -e 's/^mailsub="/gettext "/p' configure.in \
+			    -e 's/^mailsub="/gettext "/p' configure.ac \
 			    >> confstr.sh; \
 			tmpfiles=confstr.sh; \
 			cfiles="plugins/sudoers/*.c plugins/sudoers/auth/*.c";; \

config.h.in

@@ -1,4 +1,4 @@
-/* config.h.in.  Generated from configure.in by autoheader.  */
+/* config.h.in.  Generated from configure.ac by autoheader.  */
 
 #ifndef _SUDO_CONFIG_H
 #define _SUDO_CONFIG_H

configure.ac

@@ -1,5 +1,5 @@
 dnl
-dnl Process this file with GNU autoconf to produce a configure script.
+dnl Use the top-level autogen.sh script to generate configure and config.h.in
 dnl
 dnl Copyright (c) 1994-1996,1998-2013 Todd C. Miller <Todd.Miller@courtesan.com>
 dnl

doc/Makefile.in

@@ -98,10 +98,10 @@ Makefile: $(srcdir)/Makefile.in
 
 .SUFFIXES: .man
 
-varsub: $(top_srcdir)/configure.in
+varsub: $(top_srcdir)/configure.ac
 	@if [ -n "$(DEVEL)" ]; then \
 	    printf 's#@%s@#1#\ns#@%s@#1#\ns#@%s@#1#\ns#@%s@#1#\ns#@%s@#/etc#g\ns#@%s@#/usr/local#g\ns#@%s@#5#g\ns#@%s@#8#g\ns#@%s@#%s#\n' SEMAN BAMAN LCMAN PSMAN sysconfdir prefix mansectform mansectsu PACKAGE_VERSION $(VERSION) > $@; \
-	    $(SED) -n '/Begin initial values for man page substitution/,/End initial values for man page substitution/{;p;}' $(top_srcdir)/configure.in | $(SED) -e '/^#/d' -e 's/^/s#@/' -e 's/=[\\"]*/@#/' -e 's/[\\"]*$$/#g/' >> $@; \
+	    $(SED) -n '/Begin initial values for man page substitution/,/End initial values for man page substitution/{;p;}' $(top_srcdir)/configure.ac | $(SED) -e '/^#/d' -e 's/^/s#@/' -e 's/=[\\"]*/@#/' -e 's/[\\"]*$$/#g/' >> $@; \
 	fi
 
 $(srcdir)/sudo.man.in: $(srcdir)/sudo.mdoc.in