[gtk-mac-integration] Use PKG_INSTALLDIR() to set pkgconfigdir instead of hard-coding it.

[John Ralls <jralls src gnome org>]

commit 5c85722778ff59b0caefbdad9feb3261356de004
Author: John Ralls <jralls ceridwen us>
Date:   Thu May 21 11:37:48 2015 -0700

    Use PKG_INSTALLDIR() to set pkgconfigdir instead of hard-coding it.

 configure.ac     |    1 +
 data/Makefile.am |    1 -
 2 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 481293a..230bd82 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,7 @@ AM_PROG_LIBTOOL
 
 AM_PATH_GLIB_2_0([2.14.0])
 AC_MSG_CHECKING([GLib Version])
+PKG_INSTALLDIR()
 
 GTK_DOC_CHECK([1.11], [--flavour no-tmpl])
 
diff --git a/data/Makefile.am b/data/Makefile.am
index 0e1020b..1eb4792 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -1,6 +1,5 @@
 EXTRA_DIST = gtk-mac-integration-gtk3.pc.in gtk-mac-integration-gtk2.pc.in
 
-pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA =
 
 if WITH_GTK3