Adapt MSDOS port to latest changes.
config.bat: Copy lib/execinfo.in.h to lib/execinfo.in-h if needed. msdos/sedlibmk.inp: Sync with changes in lib/Makefile.in. (HAVE_DECL_ENVIRON, GNULIB_ENVIRON): Edit to require declaration through lib/unistd.h. msdos/sed1v2.inp: Sync with changes in src/Makefile.in. msdos/sed2v2.inp: Sync with changes in src/config.in. src/lisp.mk: Adjust comments to the fact that term/internal is now loaded from loadup.el. src/msdos.c (msdos_abort): Rename from emacs_abort, and make static. (msdos_fatal_signal): New function. (XMenuActivate): Adjust the call to kbd_buffer_events_waiting to its argument list. src/conf_post.h (_GL_EXECINFO_INLINE) [MSDOS]: Define to "inline" for GCC versions before 4. (emacs_raise): Define to call msdos_fatal_signal. lisp/term/pc-win.el: Don't load term/internal from here. lisp/loadup.el: Load term/internal from here.
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