sync with TeXLive to revision 46500.

source/build-aux/config.guess

source/libs/README

source/libs/poppler/Makefile.am

source/libs/poppler/Makefile.in

source/libs/poppler/configure

source/libs/poppler/configure.ac

source/libs/poppler/include/Makefile.in

source/libs/poppler/include/fofi/Makefile.in

source/libs/poppler/include/goo/Makefile.in

source/m4/kpse-pkgs.m4

source/texk/README

source/texk/kpathsea/ChangeLog

source/texk/kpathsea/kpsewhich.c

source/texk/kpathsea/pathsearch.c

source/texk/kpathsea/readable.c

source/texk/kpathsea/readable.h

source/texk/kpathsea/str-list.c

source/texk/kpathsea/str-list.h

source/texk/kpathsea/tex-file.c

source/texk/web2c/ChangeLog