import-checker: open all source files as utf-8
Before, we opened in text mode and used the default encoding to interpret the bytes within. This caused problems interpreting some byte sequences in some files. This commit changes things to always open files as UTF-8, which makes the error go away. test-check-module-imports.t now passes on Python 3.5 and 3.6 with this change. Differential Revision: https://phab.mercurial-scm.org/D7225
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