[pitivi] fix error messages when GTK+3.0 is not installed

[Olav Vitters <ovitters src gnome org>]

commit 94942b6e2f0524e15000b104ce14da44358b9d76
Author: Olav Vitters <olav vitters nl>
Date:   Mon Nov 23 19:42:43 2015 +0100

    fix error messages when GTK+3.0 is not installed
    
    See 
http://pkgsubmit.mageia.org/uploads/failure/cauldron/core/release/20151119225318.ovitters.valstar.397/log/pitivi-0.95-1.mga6/build.0.20151119225402.log
    
    checking for gobject-introspection... no
    checking for GTK... no
    configure: error: GTK+ >= .10.0 is required

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index e64dbd3..efd90b6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -89,7 +89,7 @@ PKG_CHECK_MODULES(GTK, [gtk+-3.0 >= gtk_req_version],
                         [HAVE_GTK=no])
 
 AS_IF([test "x$HAVE_GTK" = xno],
-      [AC_MSG_ERROR([GTK+ >= $gtk_req_version is required])])
+      [AC_MSG_ERROR([GTK+ >= gtk_req_version is required])])
 
 PKG_CHECK_MODULES(GTK_X11, gtk+-x11-3.0 >= gtk_req_version, HAVE_GTK_X11=yes, HAVE_GTK_X11=no)
 PKG_CHECK_MODULES(GTK_QUARTZ, gtk+-quartz-3.0 >= gtk_req_version, HAVE_GTK_QUARTZ=yes, HAVE_GTK_QUARTZ=no)
@@ -103,7 +103,7 @@ AC_SUBST(GTK_LIBS)
 
 
 AS_IF([test "x$HAVE_GSTREAMER" = xno],
-      [AC_MSG_ERROR([GStreamer >= $gstreamer_req_version is required])])
+      [AC_MSG_ERROR([GStreamer >= gstreamer_req_version is required])])
 
 PKG_CHECK_MODULES([cairo], [cairo])
 PKG_CHECK_MODULES([py3cairo], [py3cairo])