Remove latest occurence of a versionned USE_GCC, perfer USE_GCC=yes instead


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370275 35697150-7ecd-e111-bb59-0022644237b5
Fix build on 10.0.


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370276 35697150-7ecd-e111-bb59-0022644237b5
Remove LATEST_LINK and USE_AUTOTOOLS


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@370277 35697150-7ecd-e111-bb59-0022644237b5