Smll edits to fix compilation and running on Linux OS.

	modified:   src/Makefile
	modified:   src/d_deh.c
	modified:   src/d_main.c
	modified:   src/i_video.c
	modified:   src/sounds.c
	Final fix for successful Linux run. Thanks Brad Harding.
	modified:   d_main.c
	modified:   hu_stuff.c
Merge https://github.com/bradharding/doomretro

Conflicts:
	src/Makefile
	src/hu_stuff.c
	src/sounds.c
	CodeBlocks Project
	new file:   DoomRetro.cbp
	Add a TAB where there was 4 spaces. Needed for proper compilation in Linux.
	modified:   Makefile
Merge pull request #50 from Luke-Nukem/master

For linux build