Actually install gems during packaging
Actually install gems during packaging

- Now that we've added the "--no-install" directive into pre_packaging,
   when we finally get to installing those gems, we need to remove that
   directive.

- Also, now that we are finally installing gems *only* on packaging, we
   noticed that there was a hidden bug when the mysql2 gem builds native
   extensions. Normally mysql2 would have used the provided mariadb_config
   to find the lib and include files, but we were explicitly
   overwriting the lib-path and include-path with the wrong location.

[#101784138]

Signed-off-by: Evan Short <581f0aa3b394874b4e0f87045fe1f4154dc5c69c@pivotal.io>

cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release