bootstrap: pull in gnulib's ioctl module

bootstrap: pull in gnulib's ioctl module

* bootstrap: Invoke gnulib-tool with its --no-vc-files
option, since we version-control the files it imports.
This tells it not to mark imported files as cvs-ignored.
(modules): Add ioctl.
* gnulib/lib/ioctl.c: New file.
* gnulib/lib/sys_ioctl.in.h: New file.
* gnulib/tests/sys_ioctl.in.h: Removed.
* gnulib/tests/ioctl.c: Removed.
* gnulib/lib/Makefile.am: Update.
* gnulib/m4/gnulib-cache.m4: Likewise.
* gnulib/m4/gnulib-comp.m4: Likewise.
* gnulib/tests/Makefile.am: Likewise.
* gnulib/lib/.cvsignore: Ignore sys_ioctl.h.
* gnulib/lib/.gitignore: Regenerate.