autogen.sh: Try to use libtoolize before trying glibtoolize
autogen.sh: Try to use libtoolize before trying glibtoolize

This helps on Mac OS X where an old glibtoolize is included in the
system and newer, manually installed, versions provide libtoolize.

See also http://marc.info/?m=132490560131894

libusb.git commit 3df437680f8f5406795ec5f32d96612d327b2ca4

Distrotech/libusb-compat,hjelmn/libusb-compat-0.1,Distrotech/libusb-compat,hjelmn/libusb-compat-0.1,BuLogics/libusb-compat-0.1,BuLogics/libusb-compat-0.1,BuLogics/libusb-compat-0.1