autogen.sh: simplify a bit

Do not use $DEBUG to add --enable-debug - needless, moreover $DEBUG is
too general and the user may have it defined by accident for a different
purpose.

Remove cd to $ORIG_DIR, that has already been performed.

Author: MartinPulec

autogen.sh

@@ -30,16 +30,8 @@ if test -n "$RES" -a -z "$(echo $RES | grep Makefile.am)"; then
         exit 1
 fi
 
-CONFIGURE_OPTS=
-
-if [ -n "$DEBUG" ]; then
-        CONFIGURE_OPTS="$CONFIGURE_OPTS --enable-debug"
-fi
-
 cd $ORIGDIR
 
 echo "Running configure..."
-$srcdir/configure $CONFIGURE_OPTS "$@"
-
-cd $ORIGDIR
+"$srcdir"/configure "$@"