math/g2o: fix build on non-x86 architectures

This port seems to enable all SSE* CPU features even outside of x86 platforms. Disable that to fix build.

Also add USES=compiler:c++11-lang, the port needs C++11 and add USES=gl.

PR: 238895
Approved by: yuri (maintainer timeout), linimon (mentor)
Differential Revision: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238895