libtoolize: not found on MacOSX

Hi,

On Mac OS X I just encountered a problem with the latest git.
In buildconf "libtoolize" is used, but this isn't installed on my mac.
Changing this to "glibtoolize" works fine.

Using the attached patch will check first for libtoolize, and than for
glibtoolize (and exit if neither is found).

Grtz,
Steven

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