[gtk-doc] Fix up my earlier typo

[Matthias Clasen <matthiasc src gnome org>]

commit cb38668a29547292b7a269684cc5d45b70a7c4d5
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jun 28 17:13:00 2011 -0400

    Fix up my earlier typo

 gtk-doc.m4 |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk-doc.m4 b/gtk-doc.m4
index 2b59d5d..fd532d6 100644
--- a/gtk-doc.m4
+++ b/gtk-doc.m4
@@ -6,7 +6,7 @@ dnl Usage:
 dnl   GTK_DOC_CHECK([minimum-gtk-doc-version])
 AC_DEFUN([GTK_DOC_CHECK],
 [
-  AC_REQUIRE([PKG_PKG_CONFIG])
+  AC_REQUIRE([PKG_PROG_PKG_CONFIG])
   AC_BEFORE([AC_PROG_LIBTOOL],[$0])dnl setup libtool first
   AC_BEFORE([AM_PROG_LIBTOOL],[$0])dnl setup libtool first