contrib: build autotools/make targets in a build directory

After that, !2528 (merged) and !2542 (merged) only the ugliest of the build system remain not building in a separate folder.

• bgp which doesn't have a configure script but is never built (and won't build)
• gsm uses a hardcoded makefile
• fontconfig has some issues with FC_GPERF_SIZE_T detection on macOS !2606 (closed)
• freetype2 is messy and switch to CMake !2570 (merged)
• gpg-error has some issues on Android
• live555 uses a hardcoded makefile
• lua uses a hardcoded makefile
• ncurses which has a very dirty autotools usage cleaned in !2579 (merged)
• qt which is too dirty to touch
• sipplay which could be using these CMake build files instead !2571 (closed)
• zlib, which can switch to CMake !2568 (merged)

Draft on top of !2560 (merged)