Cygwin: /proc/cpuinfo: Always print topology info

Cygwin: /proc/cpuinfo: Always print topology info

vmstat from proc-ps-4.0.x prints "Unable to create system stat structure"
if the /proc/cpuinfo output fails to contain topology info.  While
Linux always prints topology info if the kernel has been built with
CONFIG_SMP, Cygwin only prints topology info if the CPU is known to
be multi-core (i. e., the HT feature flag is set).

Fix that by printing topology info all the time, even for single-core
CPUs.

Fixes: e0d48debedfa ("Fix /proc/cpuinfo topology and cache size info")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>