[3.12] gh-89886: Rely on HAVE_SYS_TIME_H (GH-105058) (#105192)

Quoting autoconf (v2.71):

    All current systems provide time.h; it need not be checked for.
    Not all systems provide sys/time.h, but those that do, all allow
    you to include it and time.h simultaneously.

(cherry picked from commit 9ab587b7146618866cee52c220aecf7bd5b44b02)

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>