Support building with modern, more standards-compliant compilers such
as GCC 4.8.

(For a project as little maintained upstream as OpenCity building with
-pedantic-errors is a bad idea anyways.)

PR:		192132
Approved by:	maintainer timeout (amdmi3, five weeks)


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@366693 35697150-7ecd-e111-bb59-0022644237b5