TST: Fix detection of Windows platform

The (k=k) can results in "multiple unsequenced modifications to 'kind'"
warning when this macro is expanded twice in the same expression.

replace C code position marker in annotated sources by ellipsis instead of discarding it to properly mark separate code chunks

strip C code position marker comments from annotated HTML files to a) avoid false positives when parsing C-API calls and b) reduce the overall clutter (the HTML contains the same content already)

add safety check for now to avoid trying to write annotation files into standard include directories etc.

--HG--
extra : amend_source : c2b02f8beedd17cdae81256283c30de6f5767e08

minor Py hex version fix for patch level when Py_hash_t was added (just in case someone still uses Py3.2 alpha versions)