sync trunk with experimental

build-shared.sh

build.sh

manual/luatex-languages.tex

manual/luatex-math.tex

manual/luatex-tex.tex

manual/luatex.pdf

source/ChangeLog

source/Makefile.am

source/Makefile.in

source/README

source/am/ChangeLog

source/am/README

source/am/bin_links.am

source/am/recurse.am

source/auxdir/auxsub/Makefile.in

source/build-aux/ar-lib

source/build-aux/config.guess

source/build-aux/config.sub

source/build-aux/texinfo.tex

source/configure