On non-clang archs, ports-clang uses the libestdc++ backend from
ports-gcc, so it needs the headers in the g++ package at runtime.
Testing CHOSEN_COMPILER == "ports-gcc" is nice semantically but since it
happens after including bsd.port.mk, it's too late to change TEST/RUN_DEPENDS.
Use a different test that may not be optimal but works in practice, so that
the dep is correctly registered.
This should fix random build failures due to dpb junking in bulk builds
on non-clang archs.
Problem pointed out by Goerge Koehler, ok sthen@
56023a8d74