improve fix for MS-DOS file name clash
* Makefile.in (DOS_gnulib_comp.m4): Renamed from DOS-gnulib-comp.m4, for portability to POSIX make. Reported by Bruno Haible. (sync-from-gnulib): Copy gl-comp.m4 (if present) back to gnulib-comp.m4 before running gnulib-tool, to prevent old gnulib files from accumulating as garbage. Also reported by Bruno Haible.
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