util: add qemu_get_host_physmem utility function
This will be used in a future patch. For POSIX systems _SC_PHYS_PAGES isn't standardised but at least appears in the man pages for Open/FreeBSD. The result is advisory so any users of it shouldn't just fail if we can't work it out. The win32 stub currently returns 0 until someone with a Windows system can develop and test a patch. Signed-off-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Cc: BALATON Zoltan <balaton@eik.bme.hu> Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com> Message-Id: <20200724064509.331-5-alex.bennee@linaro.org>
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