[gtksourceview] autogen.sh: don't set PKG_NAME (deprecated)

[Sébastien Wilmet <swilmet src gnome org>]

commit fc9078317efd2c58101b5d98e637f54a176a029d
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue Apr 28 11:03:46 2015 +0200

    autogen.sh: don't set PKG_NAME (deprecated)
    
    There was a warning during the build:
    
    ***Warning*** PKG_NAME is deprecated, you may remove it from autogen.sh

 autogen.sh |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index 1b0cd45..e2a500f 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -4,13 +4,11 @@
 srcdir=`dirname $0`
 test -z "$srcdir" && srcdir=.
 
-PKG_NAME="gtksourceview"
-
 (test -f $srcdir/configure.ac \
   && test -f $srcdir/README \
   && test -d $srcdir/gtksourceview) || {
     echo -n "**Error**: Directory "\`$srcdir\'" does not look like the"
-    echo " top-level $PKG_NAME directory"
+    echo " top-level GtkSourceView directory"
     exit 1
 }