Move LuaJIT in LuaJIT-proj directory in CMake (closes #743)

Слиты xottab-duty запросил слияние github/fork/Masterkatze/dev в dev

Created by: Masterkatze

Also fixed luajit executable build error and returned setting CMAKE_EXECUTE_PROCESS_COMMAND_ECHO to STDOUT if CMAKE_VERBOSE_MAKEFILE is set. (was removed in #742)