Tools/c-globals/check-c-statics.py should pass without any ignored globals.

[ericsnowcurrently]

(blocked by #47)

When check-c-globals.py runs it fails if it finds any static variables that it determines should not actually be global (e.g. hold per-interpreter runtime state). Currently have a fixed list of globals that we ignore, which would otherwise cause the script to fail. It needs to pass without such a list.

That list is stored in Tools/c-globals/ignored-globals.txt (or its replacement, e.g. Tools/c-analyzer/c_statics/ignored.tsv).

Here are the concrete steps we need to take:

• resolve each unsupported variable found by Tools/c-analyzer/c-statics.py
• stop using the --ignored arg in Lib/test/test_check_c_statics.py
• remove the Tools/c-analyzer/c_statics/ignored.tsv file