Use standard optimisations.

Index: engine/hexen2/server/Makefile
--- engine/hexen2/server/Makefile.orig
+++ engine/hexen2/server/Makefile
@@ -67,15 +67,6 @@ endif
 CPUFLAGS=$(CPU_X86)
 
 CFLAGS += -Wall
-CFLAGS += $(CPUFLAGS)
-ifdef DEBUG
-CFLAGS += -g
-else
-# optimization flags
-CFLAGS += -O2 -DNDEBUG=1 -ffast-math
-# NOTE: -fomit-frame-pointer is broken with ancient gcc versions!!
-CFLAGS += -fomit-frame-pointer
-endif
 
 CPPFLAGS=
 LDFLAGS =
