Disable dmc and ricochet by default in the compile

They can still be compiled by specifying their targets when running `make`

(cherry picked from commit 1b6302ab18cbdd6ab63a464dcbc7cbbcfd963f16)

linux/Makefile

@@ -140,11 +140,7 @@ TARGETS=
 
 TARGETS+= \
  	hl \
- 	dmc \
- 	ricochet \
 	hl_cdll \
-	dmc_cdll \
-	ricochet_cdll \
 
 build_dir:
 	-mkdir $(BUILD_DIR);