partial sync with texlive revision 46347.

source/build-aux/config.guess

source/build-aux/config.sub

source/build-aux/texinfo.tex

source/libs/README

source/libs/libpng/ChangeLog

source/libs/libpng/configure

source/libs/libpng/configure.ac

source/libs/poppler/ChangeLog

source/libs/poppler/TLpatches/ChangeLog

source/libs/poppler/poppler-src/poppler/Form.h

source/m4/ChangeLog

source/texk/kpathsea/ChangeLog

source/texk/kpathsea/kpathsea.pc.in

source/texk/kpathsea/mktexlsr

source/texk/kpathsea/progname.c

source/texk/kpathsea/texmf.cnf

source/texk/web2c/luatexdir/luatex_svnversion.h

source/texk/web2c/mplibdir/mp.w

source/utils/ChangeLog