Ben Cowan 81bc00d61f Adding basic Windows features (#21259) ... * Snapshot of some MSVC infrastructure added during experiments a while ago. Rebasing from spack/develop. * Added platform and OS definitions for Windows. * Updated Windows platform file to conform to new archspec use. * Added Windows as a platform; introduced some debugging code. * Added type annotations. * Fixed copyright. * Removed print statements. * Ensure `spack arch` returns correctly on Windows (#21428) * Correctly identify windows as 'windows-Windows10-AMD64'		2022-03-17 09:01:01 -07:00
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spack	Adding basic Windows features (#21259)	2022-03-17 09:01:01 -07:00