build: Remove deprecated env vars from autogen call

autogen.sh

@@ -4,8 +4,6 @@
 srcdir=`dirname $0`
 test -z "$srcdir" && srcdir=.
 
-PKG_NAME="gnome-shell"
-
 (test -f $srcdir/configure.ac \
   && test -d $srcdir/src) || {
     echo -n "**Error**: Directory "\`$srcdir\'" does not look like the"
@@ -26,4 +24,4 @@ which gnome-autogen.sh || {
     echo "your OS vendor's package manager)."
     exit 1
 }
-USE_GNOME2_MACROS=1 USE_COMMON_DOC_BUILD=yes . gnome-autogen.sh
+. gnome-autogen.sh