look for python2 symlinks before bootstrap python
Before this commit, if you're running x.py directly on a system where `python` is symlinked to Python 3, then the `python` config option will default to a Python 3 interpreter. This causes debuginfo tests to fail with an opaque error message, since they have a hard requirement on Python 2. This commit modifies the Python probe behavior to look for python2.7 and python2 *before* using the interpreter used to execute `x.py`.
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