Revert "MB-8445: Fix CPU utilization and other counters"

This reverts commit f96421129b7f9acd984b5dbfa0ff9c1c17f601ad.
Revert "MB-100: ship wmi_port.{cc,h} with make dist"

This reverts commit 9eefff2e534ce12807d268cd76d5589f4d580a1b.
Revert "MB-8386: Better system stats on Windows"

This reverts commit b83790af287ce20bfa5dcfce20664e871814f633.