[devhelp] autogen: don't define PKG_NAME (deprecated)

[Frederic Peters <fpeters src gnome org>]

commit c4f6cefc3a65e5600552cb424b49ebf1e9b0fd29
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri May 15 18:33:24 2015 +0200

    autogen: don't define PKG_NAME (deprecated)
    
    There was this warning during the build:
    
    ***Warning*** PKG_NAME is deprecated, you may remove it from autogen.sh
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749452

 autogen.sh |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index d017e2b..9b42897 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -4,11 +4,9 @@
 srcdir=`dirname $0`
 test -z "$srcdir" && srcdir=.
 
-PKG_NAME="Devhelp"
-
 (test -f $srcdir/src/dh-main.c) || {
     echo -n "**Error**: Directory "\`$srcdir\'" does not look like the"
-    echo " top-level $PKG_NAME directory"
+    echo " top-level Devhelp directory."
     exit 1
 }