specs: Port cxx2api script back to Python 2.

Unfortunately pygccxml seems abandoned and was never ported to Python3.

Change-Id: I62bdb49aaace0e003d5b9b840a084ecf630c7020
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/apitrace/+/2224547
Reviewed-by: Po-Hsien Wang <pwang@chromium.org>
Commit-Queue: Robert Tarasov <tutankhamen@chromium.org>
Tested-by: Robert Tarasov <tutankhamen@chromium.org>
1 file changed