graphics/mupdf: Update to version 1.10a.

Other port changes:

• Remove unnecessary WRKSRC definition.
• Do not strip binaries that are already stripped.
• Remove old patches.

Upstream changelog: http://mupdf.com/news

PR: 216061
Submitted by: udvzsolt@gmail.com (maintainer)
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D9178