[rhythmbox] build: Use pkg-config binary as detected by PKG_PROG_PKG_CONFIG

[Jonathan Matthew <jmatthew src gnome org>]

commit f676800eac9d866cef6b4b7fbac2024a5d4d2baf
Author: Marvin Schmidt <marv exherbo org>
Date:   Fri Jun 3 22:20:20 2016 +0200

    build: Use pkg-config binary as detected by PKG_PROG_PKG_CONFIG
    
    In cross-compilation scenarios `pkg-config` is not be the correct
    pkg-config executable for the host. PKG_PROG_PKG_CONFIG checks for
    the correct host prefixed executable and defines $PKG_CONFIG, so use
    that instead of `pkg-config`

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index bb08428..e7a03a6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -118,7 +118,7 @@ PKG_CHECK_MODULES(TOTEM_PLPARSER, totem-plparser >= $TOTEM_PLPARSER_REQS, have_t
 if test x$have_totem_plparser != xyes; then
    AC_MSG_ERROR([totem playlist parsing library not found or too old])
 else
-   if test "x`pkg-config --variable uselibcamel totem-plparser`" = "xno" ; then
+   if test "x`$PKG_CONFIG --variable uselibcamel totem-plparser`" = "xno" ; then
        AC_MSG_ERROR([totem playlist parsing library has Podcast parsing disabled])
    fi
 fi
@@ -303,7 +303,7 @@ fi
 AM_CONDITIONAL(USE_NOTIFY, test x"$enable_libnotify" = xyes)
 if test x$enable_libnotify = xyes ; then
     # Find out the version of LIBNOTIFY we're using
-    libnotify_version=`pkg-config --modversion libnotify`
+    libnotify_version=`$PKG_CONFIG --modversion libnotify`
     LIBNOTIFY_VERSION_MAJOR=`echo $libnotify_version | awk -F. '{print $1}'`
     LIBNOTIFY_VERSION_MINOR=`echo $libnotify_version | awk -F. '{print $2}'`
     LIBNOTIFY_VERSION_MICRO=`echo $libnotify_version | awk -F. '{print $3}'`