add libtool major version detection to configure in prep for supporting both…

add libtool major version detection to configure in prep for supporting both libtool 2.x and 1.5.x at the same time

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12926 d0543943-73ff-0310-b7d9-9358b9ac24b2

configure.in

@@ -76,7 +76,7 @@ m4_defun([_LT_AC_LANG_RC_CONFIG], [:])
 AM_PROG_CC_C_O
 AC_PROG_LIBTOOL
 
-libtool=$(switch_builddir)/libtool
+libtool=$switch_builddir/libtool
 LIBTOOL_MAJOR_VERSION=`$libtool --version 2>/dev/null|sed -e 's/([^)]*)//g;s/^[^0-9]*//;s/[- ].*//g;q'| awk -F . '{print $1}'`
 
 #Check for compiler vendor