Fix the MSDOS build
* config.bat: * msdos/sedlisp.inp: * msdos/sedlibmk.inp: * msdos/sedleim.inp: * msdos/sedadmin.inp: * msdos/sed6.inp: * msdos/sed3v2.inp: * msdos/sed2v2.inp: * msdos/sed1v2.inp: Adapt to Emacs 25. * src/process.c (remove_slash_colon): Move out of "#ifdef subprocesses" block, as it its called unconditionally. Move ADD_SUBFEATURE calls into "#ifdef subprocesses" block, as they reference variables only defined in that block. * src/msdos.h: Provide prototypes for IT_set_frame_parameters, faccessat, msdos_fatal_signal, syms_of_msdos, pthread_sigmask, dos_keysns, dos_keyread, run_msdos_command, and syms_of_win16select, to avoid compiler warnings. * src/msdos.c (SYS_ENVIRON): Define to either '_environ' or 'environ', depending on the DJGPP version. Remove declarations of externally-visible Lisp objects, like Qbackground_color and Qreverse. (run_msdos_command): First argument is not signed, not unsigned. Use SYS_ENVIRON. (sys_select): Use 'timespec_cmp' instead of 'timespec_sign', as the latter doesn't work when 'time_t' is an unsigned data type. This caused idle timers to behave incorrectly: they only fired after a keyboard input event. * src/frame.c (adjust_frame_size) [MSDOS]: Account for FRAME_TOP_MARGIN that isn't counted in the frame's number of lines, but dos_set_window_size needs it to be added. * src/lread.c (INFINITY, NAN) [DJGPP < 2.05]: Provide definitions. * src/fns.c (sort_vector_copy) [__GNUC__ < 4]: Provide a prototype that works around compilation errors with older GCC versions. * src/w16select.c: Don't declare QCLIPBOARD and QPRIMARY as Lisp Objects. * src/filelock.c [MSDOS]: Ifdef away most of the code. Provide no-op implementations for 'lock_file' and 'unlock_file'. (Ffile_locked_p) [MSDOS]: Always return nil. This avoids multiple ifdefs in all users of filelock.c functionality. * src/conf_post.h (EOVERFLOW, SIZE_MAX) [DJGPP < 2.04]: Define. * src/emacs.c [MSDOS]: Include dosfns.h, to avoid compiler warnings. * src/dosfns.h: Provide prototypes for dos_cleanup, syms_of_dosfns, and init_dosfns. * src/deps.mk (atimer.o): Depend on msdos.h. (emacs.o): Depend on dosfns.h. * src/atimer.c [MSDOS]: Include msdos.h, to avoid compiler warnings. * lisp/window.el (window--adjust-process-windows): Skip the body if 'process-list' is not available. This avoids failure to start up on MS-DOS. * lisp/vc/diff.el (diff-no-select): Test 'make-process', not 'start-process', as the latter is now available on all platforms. * lisp/textmodes/ispell.el (ispell-async-processp): Replace 'start-process' with 'make-process' in a comment. * lisp/term/internal.el (IT-unicode-translations): Modify and add a few translations to display Info files with Unicode markup. Fix an ancient off-by-one mismatch error with Unicode codepoints. * lisp/progmodes/compile.el (compilation-start): Test 'make-process', not 'start-process', as the latter is now available on all platforms. * lisp/man.el (Man-build-man-command, Man-getpage-in-background): Test 'make-process', not 'start-process', as the latter is now available on all platforms. * lisp/international/mule-cmds.el (set-coding-system-map): Test 'make-process', not 'start-process', as the latter is now available on all platforms. * lisp/eshell/esh-cmd.el (eshell-do-pipelines-synchronously): Doc fix. (eshell-execute-pipeline): Test 'make-process', not 'start-process', as the latter is now available on all platforms.
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