lscpu: Detect Windows Subsystem for Linux

lscpu: Detect Windows Subsystem for Linux

Windows 10 implements Windows Subsystem for Linux (WSL).

WSL does not implement support for SIGSEGV handler, which is used inside
is_vmware_platform(). As a result, lscpu crashes there.

Implement WSL detection, and as a side effect, work around the crash.
Note that none of existing virtualization types exactly matches.
But the the closest would be "container".

References:

Provide a way to positively detect WSL from an app compiled on Linux.
https://github.com/Microsoft/BashOnWindows/issues/423

missing support for SIGSEGV handler
https://github.com/Microsoft/BashOnWindows/issues/1637

Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>