net-p2p/tremotesf: enable "test" make target and cleanup
www/cpp-httplib cannot be used for tests as CMake explicitly checks for
version not higher than 0.12, so pull in latest supported from GitHub
instead.
While here:
- Switch to full commit hash for libtremotesf to reduce potential risk of collisions
- Switch "Concurrent" Qt dependency from "build+lib" to "build" type as bin/tremotesf doesn't link against it; bump PORTREVISION as package dependencies changed
- Process Makefile with portfmt once more
PR: 274328