* bootstrap (gnulib_tool_option_extras): Put this back; it was

* bootstrap (gnulib_tool_option_extras): Put this back; it was
inadvertently omitted from gnulib.
(gnulib_tool_option): Use it.
* .cvsignore: Add *._bootmp*.
* lib/.cvsignore: Add stdlib.h, stdlib_.h, time.h, time_.h, unistd.h.
Remove alloca.c, alloca.h, alloca_.h, exit.h, getdelim.c, getdelim.h,
getline.c, getline.h, malloc.c, mbchar.c, mbchar.h, mbuiter.h, memchr.c,
regcomp.c, regex.c, regex.h, regex_internal.c, regex_internal.h,
regexec.c, rpmatch.c, stdint.h, stdint_.h, strcase.h, strcasecmp.c,
strncasecmp.c, strnlen1.c, strnlen1.h, timespec.h, wcwidth.h.
* m4/.cvsignore: Add stdlib_h.m4, time_h.m4.
Remove alloca.m4, codeset.m4, getdelim.m4, getline.m4,
longlong.m4, mbchar.m4, mbiter.m4, mbrtowc.m4, memchr.m4, regex.m4,
rpmatch.m4, ssize_t.m4, stdint.m4 strcase.m4, timespec.m4, ulonglong.m4,
wchar_t.m4, wcwidth.m4, wint_t.m4.