"install" script and libtool 2.4

[igorgolovanov]

If installed libtool 2.4 or newest (i think, newest than 2.2) then when run "install" it falls with errors:

libtool: Version mismatch error.  This is libtool 2.4, but the
libtool: definition of this LT_INIT comes from an older release.
libtool: You should recreate aclocal.m4 with macros from libtool 2.4
libtool: and run autoconf again.

Build this extension can if you'll do reconfig.

$ cd ext
$ phpize 
$ aclocal && libtoolize --force && autoreconf
$ ./configure

I think need to add into "install" script checking version libtool, and doing "aclocal && libtoolize --force && autoreconf" when libtool is a newest version.

[phalcon]

Could you please submit this fix to the installation script?

[niden]

Implemented #581