FreeBSD: turn off some warnings

Someday these can be addressed, but for now they are just noise.

cde/config/cf/FreeBSD.cf

@@ -182,7 +182,8 @@ USE_GCC = UseGcc
 /* The GCC strength-reduce bug is fixed for FreeBSD 2.1.5 and later */
 #ifndef DefaultGcc2i386Opt
 #if OSMajorVersion > 2 || (OSMajorVersion == 2 && OSMinorVersion > 1) || (OSMajorVersion == 2 && OSMinorVersion == 1 && OSTeenyVersion >= 5)
-#define DefaultGcc2i386Opt -O2 -fno-strict-aliasing
+#define DefaultGcc2i386Opt -O2 -fno-strict-aliasing -Wno-write-strings \
+        -Wno-unused-result -Wno-deprecated-register
 #endif
 #endif