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0f6b1fe4 - Upgrade to libtool 2.5.3.

Upgrade to libtool 2.5.3. * m4/libtool.m4: Update from libtool-2.5.3. * m4/ltoptions.m4: Likewise. * m4/ltsugar.m4: Likewise. * m4/ltversion.m4: Likewise. * m4/lt~obsolete.m4: Likewise. * build-aux/ltmain.sh: Likewise.