Gnulib fails to detect nanosleep in MinGW runtime

[Eli Zaretskii]

While building the latest pretest of wget2, I saw that the Gnulib's
detection of nanosleep fails to detect its presence in mingw.org's
MinGW runtime.  The test program used for that fails for unrelated
reason: it uses SIGALRM, which is unavailable on MS-Windows.

I'm guessing that SIGALRM is used to guard against buggy nanosleep
implementations, and if so, perhaps the test program could be modified
to avoid using SIGALRM on Windows.

Thanks.