mysql: boost is only build time
mysql: boost is only build time

According to the mysql release notes, Boost.Geometry is required to build MySQL (see https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-5.html).
However, Boost.Geometry is a header-only library, and only need to actually *build* MySQL...it is not needed as a runtime dependency.
This patch just changes the dependency on boost for MySQL to be build-time only.

See conversation at https://github.com/Homebrew/homebrew/commit/df384ee28529b4822b3fe222a7c5d4f523812338 for details and discussion that lead to this PR

Closes Homebrew/homebrew#47011.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

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