* libc/include/sys/_sigset.h: New.
* libc/include/sys/select.h: Do not include <sys/types.h> and
<sys/time.h> to avoid cyclic header file dependencies. Include
specialized header files instead.
(sigset_t): Conditionally define.
* libc/include/sys/signal.h (sigset_t): Likewise.
* libc/include/sys/time.h: Include <sys/select.h> if
__BSD_VISIBLE.
* libc/include/sys/types.h: Likewise.
* libc/include/sys/types.h: Move definitions of NBBY and howmany to
sys/param.h. Move definitions of select(2) macros to sys/select.h.
* libc/include/sys/param.h: See above.
* libc/include/sys/select.h: Move Cygwin's sys/select.h here.
* include/sys/select.h: Move select(2) macros from newlib's sys/types.h
here. Rename howmany to _howmany to unclutter namespace. Move file to
newlib.
* libc/rexex.cc: Add declaration for cygwin_gethostname.
* poll.cc: Include sys/param.h and locale select.h.
* select.h (cygwin_select): Declare.
* uname.cc: Declare cygwin_gethostname.
* winsup.h: Drop declarations of cygwin_select and cygwin_gethostname.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>