Summary:
Update the C files under edenscm/mercurial/cext to use absolute includes from
the repository root. Also update a few of the libraries in edenscm/mercurial
that the cext code depends on.
This makes these files easier to build with Buck in fbsource, and reduces the
number of places where we have to use deprecated Buck functionality to help
find these headers. This also allows autodeps to work with the build targets
for these rules.
Reviewed By: xavierd
Differential Revision: D19958221
fbshipit-source-id: e6e471583a795ba5773bae5f16ed582c9c5fd57e
Any native code (C/C++/Rust) that Mercurial (either core or extensions)
depends on should go here. Python code, or native code that depends on
Python code (e.g. #include <Python.h> or use cpython) is disallowed.
As we start to convert more of Mercurial into Rust, and write new paths
entrirely in native code, we'll want to limit our dependency on Python, which is
why this barrier exists.
See also hgext/extlib/README.md, mercurial/cext/README.mb.
How do I choose between lib and extlib (and cext)?
If your code is native and doesn't depend on Python (awesome!), it goes here.
Otherwise, put it in hgext/extlib (if it's only used by extensions) or
mercurial/cext (if it's used by extensions or core).
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