games/scummvm-tools: Add USES=compiler:c++11-lang, enable verbose build

Add USES=compiler:c++11-lang to fix linking on GCC architectures.

Also add --enable-verbose-build to generate more messages during build.

PR: 237226
Approved by: lme (maintainer), mat (mentor)
Differential Revision: https://reviews.freebsd.org/D19988