AC_PROG_LIBTOOL is deprecated in libtool, LT_INIT is used instead



git-svn-id: http://svn.code.sf.net/p/cmusphinx/code/trunk@12655 94700074-3cef-4d97-a70e-9c8c206c02f5
Fixes sphinx2 build



git-svn-id: http://svn.code.sf.net/p/cmusphinx/code/trunk@12656 94700074-3cef-4d97-a70e-9c8c206c02f5