build-and-install-cmake.sh: Improve script to speedup build time
build-and-install-cmake.sh: Improve script to speedup build time

* faster source checkout specifying tag and depth
* remove obsolete comments
* disable testing

thewtex/cross-compilers,dockcross/dockcross,thewtex/cross-compilers,dockcross/dockcross,thewtex/cross-compilers,dockcross/dockcross,dockcross/dockcross,thewtex/cross-compilers