[file-roller] configure: use ${PKG_CONFIG} instead of pkg-config

[Paolo Bacchilega <paobac src gnome org>]

commit 6111f3a98cf3a3eb839835a8fceb0eed1f767e9e
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Tue Sep 22 17:27:00 2015 +0200

    configure: use ${PKG_CONFIG} instead of pkg-config

 configure.ac |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index bd2298e..d7183ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -171,9 +171,9 @@ LIBNOTIFY_CFLAGS=""
 if test x"$enable_notification" = xyes; then
    AC_MSG_CHECKING(for notification support)
 
-   if pkg-config --atleast-version=$LIBNOTIFY_REQUIRED libnotify; then
-      LIBNOTIFY_LIBS=`pkg-config --libs libnotify`
-      LIBNOTIFY_CFLAGS=`pkg-config --cflags libnotify`
+   if ${PKG_CONFIG} --atleast-version=$LIBNOTIFY_REQUIRED libnotify; then
+      LIBNOTIFY_LIBS=`${PKG_CONFIG} --libs libnotify`
+      LIBNOTIFY_CFLAGS=`${PKG_CONFIG} --cflags libnotify`
       AC_DEFINE(ENABLE_NOTIFICATION, 1, [Have libnotify])
    else
       enable_notification=no
@@ -230,9 +230,9 @@ LIBARCHIVE_CFLAGS=""
 if test x"$enable_libarchive" = xyes; then
    AC_MSG_CHECKING(for libarchive support)
 
-   if pkg-config --atleast-version=$LIBARCHIVE_REQUIRED libarchive; then
-      LIBARCHIVE_LIBS=`pkg-config --libs libarchive`
-      LIBARCHIVE_CFLAGS=`pkg-config --cflags libarchive`
+   if ${PKG_CONFIG} --atleast-version=$LIBARCHIVE_REQUIRED libarchive; then
+      LIBARCHIVE_LIBS=`${PKG_CONFIG} --libs libarchive`
+      LIBARCHIVE_CFLAGS=`${PKG_CONFIG} --cflags libarchive`
       AC_DEFINE(ENABLE_LIBARCHIVE, 1, [define to enable libarchive support])
    else
       enable_libarchive=no