* configure (lang_flags): Let us switch from using _XOPEN_SOURCE=2

to _POSIX_C_SOURCE=199309L and _BSD_SOURCE.
In the .exe suffix test, try harder to redirect ls's output.
Test for fork stuff now needs <sys/types.h> evidently;
<unistd.h> does not necessarily pid_t, even though it defines
functions that return and accept pid_t!
The timegm test no longer needs _SVID_SOURCE since _BSD_SOURCE
covers it, and so we end up not using _SVID_SOURCE any more.
New tests for usleep and nanosleep.
The test for setenv is not conditional on timegm failing.

* eval.c: Include <time.h> and conditionally <windows.h>.
(usleep_wrap): New function.
(eval_init): New usleep_wrap function registered as usleep intrinsic.

* lib.c: Only define setenv and unsetenv if we don't have timegm,
because only in that situation they are used.

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