Add yaml-cpp #678

Job	Run time
prepare_jobs	8s
build (angelscript)	36s
build (argtable2)	27s
build (bzip2)	42s
build (cjson)	31s
build (eigen3)	34s
build (enet)	27s
build (expat)	37s
build (glm)	34s
build (jpeg)	45s
build (jsoncpp)	36s
build (kubridge)	26s
build (libbulletml)	31s
build (libconfuse)	54s
build (libdumb)	31s
build (libintrafont)	22s
build (libmad)	25s
build (libmikmod)	37s
build (libmodplug)	28s
build (libogg)	31s
build (libpspexploit)	23s
build (libpspvram)	29s
build (libun7zip)	23s
build (libxmp)	41s
build (libxmp-lite)	35s
build (libyaml)	29s
build (lua)	27s
build (lua51)	28s
build (mbedtls)	32s
build (mini18n)	23s
build (openal)	58s
build (pocketpy)	1m 0s
build (polarssl)	36s
build (pspgl)	31s
build (pspirkeyb)	25s
build (sqlite)	37s
build (squirrel)	44s
build (zlib)	30s
build_depends (curl)	1m 19s
build_depends (libpng freetype2)	36s
build_depends (libpng)	27s
build_depends (libvorbis)	35s
build_depends (libzip)	49s
build_depends (libpng minizip)	40s
build_depends (libpng freetype2 opentri)	39s
build_depends (libpng pixman)	1m 1s
build_depends (sdl)	1m 4s
build_depends (libpng freetype2 sdl sdl-gfx)	1m 21s
build_depends (libpng sdl sdl-image)	1m 25s
build_depends (libvorbis sdl sdl-mixer)	1m 21s
build_depends (libpng freetype2 sdl sdl-ttf)	1m 24s
build_depends (sdl2)	1m 9s
build_depends (sdl2 sdl2-gfx)	1m 21s
build_depends (libpng sdl2 sdl2-image)	1m 21s
build_depends (libvorbis sdl2 sdl2-mixer)	1m 20s
build_depends (libpng freetype2 sdl2 sdl2-ttf)	1m 20s
build_depends (sdl smpeg)	1m 13s
build_depends (yaml-cpp)	40s
build_depends (zziplib)	32s
create_release	0s
docker-layer	0s
	42m 30s

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