Patch #2. This patch removes the following CMake checks:

TIME_T_UNSIGNED - always false on supported platforms.
HAVE_GETADDRINFO - always true on supported platforms.
HAVE_SELECT - always true on supported platforms.
QSORT_TYPE_IS_VOID - always true on supported platforms.
HAVE_SOCKET_SIZE_T_AS_socklen_t - always true for non-Windows.
SIGNAL_RETURN_TYPE_IS_VOID - always true on supported platforms.
HAVE_POSIX_SIGNALS - result not used.
HAVE_BSD_SIGNALS - always false on supported platforms.
HAVE_SVR3_SIGNALS - result not used.
HAVE_V7_SIGNALS - result not used.

Remove the following typedefs:
puchar - not used
pshort - not used
pfloat - not used

Remove the following macros:
STRUCT_RLIMIT - always struct rlimit
sig_handler - always void
qsort_t - always void
SORT_RETURN - always return

Remove the following files:
dbug_long.h - not used
my_sleep.c - move contents to my_sys.h