Update LuaJIT commit hash

CMakeLists.txt

@@ -201,7 +201,7 @@ endif()
 
 set(MEGA_ZLIB_VER "1.2.11")
 set(MEGA_LUA51_VER "5.1.5")
-set(MEGA_LUAJIT_VER "2.1.0-1d8b747")
+set(MEGA_LUAJIT_VER "2.1.0-ec6edc5")
 set(MEGA_LIBOGG_VER "1.3.2")
 set(MEGA_LIBVORBIS_VER "1.3.5")
 set(MEGA_LIBTHEORA_VER "1.1.1")