branches: 1.5.34; 1.5.40;
Changes required for FORTIFY_SOURCE: don't rely on #define read (etc.)
before system header file inclusion magically causing what "read" is
#defined to to pick up a read-like prototype. For sanity's sake, put
prototypes for revolting trace_mr stuff in their own header file (instead
of nowhere at all and using the trick referenced above).