Revert unnecessary workaround introduced to fix Bug 701977.
Revert unnecessary workaround introduced to fix Bug 701977.

Freetype 2.10.0 had an issue that resulted in MuPDF bug 701977.
It was reported upstream as issue 57519. While waiting for a
fix Tor introduced a workaround was in commit 82196fd87.
Upstream later released Freetype 2.10.2 which includes a fix
for issue 57519. With MuPDF recently updating Freetype from
2.10.0 to 2.10.4 the workaround is no longer necessary and
is therefore reverted.

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