[gparted] Avoid splitting Autoconf check message for libparted version (#740004)

[Curtis Gedak <gedakc src gnome org>]

commit 5a93a9c432e9fe62ac4df16d96aeb9def81bfd6a
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Fri Nov 14 09:14:40 2014 +0000

    Avoid splitting Autoconf check message for libparted version (#740004)
    
    First use of PKG_CHECK_EXISTS causes additional checking messages to be
    reported which splits the libparted version check message from it's
    result, like this:
    
        checking for libparted >= 1.7.1 (querying pkg-config)... checking for pkg-config... 
/usr/bin/pkg-config
        checking pkg-config is at least version 0.9.0... yes
        2.3
    
    Call PKG_CHECK_EXISTS early, before first use to avoid this.  Output
    now looks like:
    
        checking for pkg-config... /usr/bin/pkg-config
        checking pkg-config is at least version 0.9.0... yes
        :
        checking for libparted >= 1.7.1 (querying pkg-config)... 2.3
    
    Bug 740004 - use pkg-config to check for version of libparted

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e1709bc..78127b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,6 +16,8 @@ AC_PROG_CXX
 AC_PROG_CC
 AC_PROG_LIBTOOL
 AC_PROG_AWK
+dnl Check for pkg-config early to avoid splitting message when first used.
+PKG_CHECK_EXISTS
 
 
 dnl======================