configure.ac: respect 'g' variants of libtool/libtoolize

BSD OS'es (OS X for me) provide GNU tools with prefixed 'g'. To find correct
versions of libtool/libtoolize on those systems search also for
glibtool/glibtoolize.

Signed-off-by: Andreas Bießmann <andreas@biessmann.de>
Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>
[yann.morin.1998@free.fr: search for the g-variant first]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <2f1530b54afcb6a00e1d.1395158786@andreas-mbp.er.biessmann.org>
Patchwork-Id: 331467

diff -durN glibc-ports-2.7.orig/sysdeps/unix/sysv/linux/arm/ioperm.c glibc-ports-2.7/sysdeps/unix/sysv/linux/arm/ioperm.c

--- glibc-2.7.orig/glibc-ports-2.7/sysdeps/unix/sysv/linux/arm/ioperm.c	2005-06-10 13:12:09.000000000 +0200

+++ glibc-2.7/glibc-ports-2.7/sysdeps/unix/sysv/linux/arm/ioperm.c	2008-05-18 16:19:45.000000000 +0200

@@ -45,7 +45,6 @@

 #include <sys/mman.h>

 #include <linux/version.h>

-#include <asm/page.h>

 #include <sys/sysctl.h>

 #define PATH_ARM_SYSTYPE	"/etc/arm_systype"