Fix build of kdevelop on FreeBSD8 and 9

devel/kdevplatform requires a c++11 conformant compiler and runtime
libraries. Further, it exposes these requirements to its consumer
PORTS by exposing c++11 stl interfaces in its header files.

Also, devel/kdevelop requires a c++11 runtime library by its usage of
initializer lists on top of its kdevplatform consumage.

Have the kdevplatform, kdevelop and kdevelop-php PORTS require a
corresponsing toolchain by USEing compiler:c++11-lib

While here, add cmake:outsource to these ports.

PR: 195742
Approved by: rakuco (mentor)