What changed in EDuke32, build by build

Fix building the tools on Mac.

Mess with Wii stuff to fix a majority of its make invocation circumstances.

Move rules around to unbreak Linux builds. This may be a GNU Make bug. DONT_BUILD.

Fix STARTUP_WINDOW=0 on Windows so that the resource objects are built, but the editor's startup window is not. DONT_BUILD.

Remove -fno-pic from everywhere. This should fix building on Ubuntu 16.10 and any other platform that has PIE enabled.

Revert r5864 and move some code introduced in r5762 to a later Mac-only block so that architecture detection is not broken on Linux.

Output the postprocessed Lunatic symbol lists to $(DUKE3D_OBJ) so they don't need special cleanup and ignore rules. Also fix building the Lunatic-enabled editor on OS X.

Fix erroneous tab characters.

Update/fix treatment of libpng libraries and headers under Windows and OS X.