libtool fix for OS X#2

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MaddTheSane wants to merge 2 commits intoctm:masterfrom

MaddTheSane:master

Commits on Jul 11, 2013

Make autogen.sh work on Darwin/OS X by checking for glibtool/glibtoolize first.
MaddTheSane
committed

Commits on Jul 16, 2013

Get the glibtool/libtool checker in autogen.sh to work on an actual system.
MaddTheSane
committed