Remove HAVE_TIME_H

Remove HAVE_TIME_H

The `<time.h>` header file is part of the standard C89 headers [1] and
on current systems can be included unconditionally.

Since PHP requires at least C89 or greater, the `HAVE_TIME_H` symbol
defined by Autoconf in ext/pdo_sqlite/config.m4 [2] can be ommitted and
simplifed.

Additionally, since PHP didn't define `HAVE_TIME_H` prior in the
configure.ac the occurrence of this symbol in cli can be removed.

Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
[2] https://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4