Rename build/*.ac to build/configure.ac.*.

Also rename configure.in to configure.ac (finally)

	configure.in		-> configure.ac
	build/analysis.ac	-> build/configure.ac.analysis
	build/enable.ac		-> build/configure.ac.enable
	build/system.ac		-> build/configure.ac.system
	build/tools.ac		-> build/configure.ac.tools
	build/version.ac	-> build/configure.ac.version
	build/warnings.ac	-> build/configure.ac.warnings

autogen.sh

@@ -19,17 +19,16 @@ AUTOHEADER=${AUTOHEADER-autoheader}
 AUTOMAKE_FLAGS="--add-missing --foreign"
 AUTOCONF=${AUTOCONF-autoconf}
 
-CONFIGURE_IN=
-test -f configure.in && CONFIGURE_IN=configure.in
-test -f configure.ac && CONFIGURE_IN=configure.ac
+CONFIGURE_AC=
+test -f configure.ac && CONFIGURE_AC=configure.ac
 
-if test "X$CONFIGURE_IN" = X; then
+if test "X$CONFIGURE_AC" = X; then
   echo "$ARGV0: ERROR: No $srcdir/configure.in or $srcdir/configure.ac found."
   exit 1
 fi
 
 extract_version() {
-	grep "^ *$1" $CONFIGURE_IN build/*.ac | sed 's/.*(\[*\([^])]*\)]*).*/\1/'
+	grep "^ *$1" $CONFIGURE_AC build/configure.ac.* | sed 's/.*(\[*\([^])]*\)]*).*/\1/'
 }
 
 autoconf_min_vers=`extract_version AC_PREREQ`

configure.in → configure.ac

@@ -12,12 +12,12 @@ dnl ===========================================================================
 dnl
 dnl The order of the includes here is rather important
 dnl
-m4_include(build/version.ac)	dnl macros setting up various version declares
-m4_include(build/tools.ac)	dnl checks for tools we use
-m4_include(build/system.ac)	dnl checks for system functions, headers, libs
-m4_include(build/enable.ac)	dnl macros for backend/feature enablement
-m4_include(build/warnings.ac)	dnl checks for compiler warning
-m4_include(build/analysis.ac)	dnl checks for analysis tools (lcov, etc)
+m4_include(build/configure.ac.version)	dnl macros setting up various version declares
+m4_include(build/configure.ac.tools)	dnl checks for tools we use
+m4_include(build/configure.ac.system)	dnl checks for system functions, headers, libs
+m4_include(build/configure.ac.enable)	dnl macros for backend/feature enablement
+m4_include(build/configure.ac.warnings)	dnl checks for compiler warning
+m4_include(build/configure.ac.analysis)	dnl checks for analysis tools (lcov, etc)
 AC_CACHE_SAVE
 
 dnl ===========================================================================