Improve handling of Windows DLL directories when executing programs.

Improve handling of Windows DLL directories when executing programs.

Reported by Michele Locati <mlocati@gmail.com>
at <https://savannah.gnu.org/bugs/?66356>.

Revert commit e2839b591c from 2019-05-01. Instead, use gnulib's new feature.

* gettext-tools/src/Makefile.am (DEFS): Define BINDIR.
* gettext-tools/src/msginit.c: Don't include configmake.h.
(main): Don't add BINDIR to PATH globally.
(get_user_email, language_team_address, plural_forms): Pass a dll_dirs argument
to create_pipe_in.
* autogen.sh (GNULIB_MODULES_TOOLS_FOR_SRC): Remove configmake.