Revert last two changes.

Fixes: debbugs:17438

ChangeLog

-2014-05-11  Paul Eggert  <eggert@cs.ucla.edu>
-
-	Require pkg-config 0.26 or later (Bug#17438).
-	Earlier versions are buggy, as pkg-config --libs can output
-	nothing, which causes xrandr link failures.
-	* autogen.sh (pkg_config_min): Make this at least 0.26.
-
 2014-05-07  Glenn Morris  <rgm@gnu.org>
 
 	* autogen.sh: Check for failing aclocal.

autogen.sh

@@ -42,11 +42,6 @@ autoconf_min=`sed -n 's/^ *AC_PREREQ(\([0-9\.]*\)).*/\1/p' configure.ac`
 automake_min=`sed -n 's/^ *AM_INIT_AUTOMAKE(\([0-9\.]*\)).*/\1/p' configure.ac`
 
 pkg_config_min=`sed -n 's/^ *PKG_PROG_PKG_CONFIG(\([0-9\.]*\)).*/\1/p' configure.ac`
-# Building from the repository needs pkg-config 0.26 or later; see Bug#17438.
-case $pkg_config_min in
-  0.[0-9] | 0.[0-9].* | 0.1[0-9] | 0.1[0-9].* | 0.2[0-5] | 0.2[0-5].* )
-    pkg_config_min=0.26
-esac
 
 ## $1 = program, eg "autoconf".
 ## Echo the version string, eg "2.59".