On Windows we need to be able to create both Linux and Windows OCI spec
files by default to support WCOW and LCOW scenarios. This merges the
compile time differences into runtime differences between the two based
on the spec and platform the user sets.
It maintains the old behavior with Default specs resulting in the
platform default the binary is compiled for.
Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>
c818a6b13d