The cmake benchmarks used the make backend on linux and cygwin, and the vcbuild, msbuild and mscv-ide backend on windows/msvc. The ninja backend is indeed faste

The cmake benchmarks used the make backend on linux and cygwin, and the vcbuild, msbuild and mscv-ide backend on windows/msvc. The ninja backend is indeed faster than the make one. An update to these benchmarks is needed to take it into account. PS: I fixed the broken links in that benchmark page.