sync with experimental.

source/configure

source/texk/README

source/texk/texlive/linked_scripts/Makefile.am

source/texk/texlive/linked_scripts/Makefile.in

source/texk/web2c/ChangeLog

source/texk/web2c/Makefile.in

source/texk/web2c/NEWS

source/texk/web2c/ctangleboot.cin

source/texk/web2c/cwebdir/ChangeLog

source/texk/web2c/cwebdir/Makefile

source/texk/web2c/cwebdir/comm-mac.ch

source/texk/web2c/cwebdir/comm-man.ch

source/texk/web2c/cwebdir/comm-ql.ch

source/texk/web2c/cwebdir/comm-w2c.ch

source/texk/web2c/cwebdir/comm-w2c.h

source/texk/web2c/cwebdir/common.h

source/texk/web2c/cwebdir/common.w

source/texk/web2c/cwebdir/ctang-bs.ch

source/texk/web2c/cwebdir/ctang-man.ch

source/texk/web2c/cwebdir/ctang-pc.ch