$OpenBSD$

Remove hardcoded CFLAGS.

Index: src/tools/make/oberon.mk
--- src/tools/make/oberon.mk.orig
+++ src/tools/make/oberon.mk
@@ -7,7 +7,6 @@
 
 
 # Be independent of any CFLAGS settings in the calling environment
-CFLAGS =
 
 # Gnu make has the make initial directory in CURDIR, BSD make has it in .CURDIR.
 ROOTDIR = $(CURDIR)$(.CURDIR)
