Sync with TL 36103; some patches for MP.

source/Makefile.in

source/build-aux/ltmain.sh

source/configure

source/doc/ChangeLog

source/doc/Makefile.in

source/doc/build-tools.txt

source/doc/tlbuild.info

source/libs/lua52/Makefile.in

source/libs/lua52/configure

source/libs/lua52/include/Makefile.in

source/libs/luajit/Makefile.in

source/libs/luajit/configure

source/libs/luajit/include/Makefile.in

source/m4/libtool.m4

source/m4/ltoptions.m4

source/m4/ltsugar.m4

source/m4/ltversion.m4

source/m4/lt~obsolete.m4

source/texk/kpathsea/Makefile.in

source/texk/kpathsea/configure