[autogen.sh] Prefer glibtoolize to libtoolize if available

Makes OS X users happy.

INSTALL

@@ -172,11 +172,6 @@ the autogen.sh script. That can be as simple as:
 
 	./autogen.sh
 
-Or, if you're using Mac OS X, you'll have to let it know to use
-glibtool by instead doing:
-
-	LIBTOOLIZE=glibtoolize ./autogen.sh
-
 But before you run that command, note that the autogen.sh script
 accepts all the same arguments as the configure script, (and in fact,
 will generate the configure script and run it with the arguments you

autogen.sh

@@ -14,7 +14,6 @@ cd $srcdir
 
 PACKAGE=cairo
 
-LIBTOOLIZE=${LIBTOOLIZE-libtoolize}
 LIBTOOLIZE_FLAGS="--copy --force"
 AUTOHEADER=${AUTOHEADER-autoheader}
 AUTOMAKE_FLAGS="--add-missing --foreign"
@@ -142,7 +141,7 @@ version_check automake AUTOMAKE "$AUTOMAKE automake automake-1.10 automake-1.9 a
 ACLOCAL=`echo $AUTOMAKE | sed s/automake/aclocal/`
 
 
-version_check libtool LIBTOOLIZE $LIBTOOLIZE $libtoolize_min_vers \
+version_check libtool LIBTOOLIZE "$LIBTOOLIZE glibtoolize libtoolize" $libtoolize_min_vers \
     "http://ftp.gnu.org/pub/gnu/libtool/libtool-${libtool_min_vers}.tar.gz" || DIE=1
 
 if test -z "$ACLOCAL_FLAGS"; then