cmake: make DaemonPlatform/Architecture/Compiler/BuildInfo autonomous and reusable

[illwieckz]

Some revamp of the DaemonPlatform/DaemonArchitecture/DaemonCompiler/DaemonBuildInfo helper code for CMake.

I want this framework to be reusable for other projects, the first user outside of the engine may be the NaCl loader itself, and I may use it for NetRadiant as well at some point. So I made the code fully autonomous and contained in a single folder (so it can be copied and kept it sync easily).

It happens that the endian stuff we did in the DaemonCompiler code using Endian.h was useless (it was not doing better than what the qprocessordetection.h code does anyway), so I removed it.

I also renamed GAME_PIE to NACL_PIE because it's an NaCl option, it was named GAME_PIE because we only build games as NaCl, but for a self-contained framework we better name the NaCl option NACL. For now this code sets GAME_PIE to the NACL_PIE value but once the game is modified to use NACL_PIE the code setting the GAME_PIE alias will be deleted.

[slipher]

Why would we need a variable called NACL_PIE? There is no PIE for NaCl and never will be.