winbuild: fix makefile clean

- Fix and move 'clean' code that removes the output and obj directories
  trees from MakefileBuild.vc to Makefile.vc.

Prior to this change the 'clean' code did not work right because the
variables containing the directory names were not fully initialized and
the rmdir syntax was sometimes incorrect (typos). DIRDIST for example
was set to ..\builds\ and not ..\builds\$(CONFIG_NAME_LIB)\ so it would
remove the former and not the latter. If WITH_PREFIX was set then that
directory was removed instead.

Also, DIRDIST (the output directory) even if initialized should not be
removed by MakefileBuild.vc because by that time it could be set to a
user directory that may contain other files if WITH_PREFIX is set (eg we
don't want rmdir /s /q C:\usr\local). Therefore we remove from
Makefile.vc before any of that happens. I added a comment in both
makefiles explaining this.

Closes https://github.com/curl/curl/pull/10576

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