OpenBSD wants DIR_HAS_BSD_GROUP_SEMANTICS, just like FreeBSD

Index: config.mak.uname
--- config.mak.uname.orig
+++ config.mak.uname
@@ -280,8 +280,7 @@ ifeq ($(uname_S),FreeBSD)
 	FILENO_IS_A_MACRO = UnfortunatelyYes
 endif
 ifeq ($(uname_S),OpenBSD)
-	NO_STRCASESTR = YesPlease
-	NO_MEMMEM = YesPlease
+	DIR_HAS_BSD_GROUP_SEMANTICS = YesPlease
 	USE_ST_TIMESPEC = YesPlease
 	NEEDS_LIBICONV = YesPlease
 	BASIC_CFLAGS += -I/usr/local/include