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makefile: stop setting unused HGEXTDIR variable during osx build

Authored by martinvonz.

Description

makefile: stop setting unused HGEXTDIR variable during osx build

The variable was added in a38ed42cd23c (osx: include chg by default,
2017-03-20), but I can't find any others references to the variable in
that commit or in any other commits.

Differential Revision: https://phab.mercurial-scm.org/D8915