Microchange for small detect fail in autogen.sh

The ./autogen.sh was not checking for glibtoolize when failed to detect libtoolize.

** Forget about this one, I will follow bregma suggestions and ask for new pull after testing this.
-- Chat reference -- 
[01:16am] bregma_: I would recommend just replacing the contents of autogen.sh with just autoreconf -if, it just does the right thing (most autogen.sh scripts predate autoreconf)
[01:17am] bregma_: you might file a pull request for that, after doing your testing
[01:17am] dvicino: okis, I will
[01:18am] bregma_: it also means you should remove config.sub, config.guess, ltmain.sh, and libtool from source control because autoreconf will generate up-to-date ones that will not break builds when checkout out on incompatible platforms
[01:18am] bregma_: it's not required, though