Small tweaks to FreeBSD build (#74)

* Do not pull CFLAGS into BASE_CFLAGS on FreeBSD

* Use -On level from CFLAGS on FreeBSD

Makefile

@@ -542,15 +542,15 @@ ifeq ($(PLATFORM),freebsd)
    endif
 
   # flags
-  BASE_CFLAGS = $(shell env MACHINE_ARCH=$(ARCH) make -f /dev/null -VCFLAGS) \
+  BASE_CFLAGS = \
     -Wall -fno-strict-aliasing -Wimplicit -Wstrict-prototypes \
     -DHOMEPATH=\\\"$(HOMEPATH)\\\" \
     -DDEFAULT_LIBDIR=\\\"$(DEFAULT_LIBDIR)\\\" \
     -DUSE_ICON -DMAP_ANONYMOUS=MAP_ANON
   CLIENT_CFLAGS += $(SDL_CFLAGS)
   HAVE_VM_COMPILED = true
 
-  OPTIMIZEVM = -O3 -funroll-loops -fomit-frame-pointer
+  OPTIMIZEVM =
   OPTIMIZE = $(OPTIMIZEVM) -ffast-math
 
   SHLIBEXT=so