tcg: Drop the FreeBSD specific code

It looks like this isn't needed. kib@ and kevans@ say it's bogus.
Drop it (fold this with older commit on next rebase).

Signed-off-by: Warner Losh <imp@freebsd.org>

Author: bsdimp

accel/tcg/user-exec.c

@@ -274,13 +274,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
 
     pc = PC_sig(uc);
     return handle_cpu_signal(pc, info,
-#if defined(__FreeBSD__) || defined(__DragonFly__)
-                             (TRAP_sig(uc) == 0xe ||
-                              TRAP_sig(uc) == 0xc) ?
-#else
-                             TRAP_sig(uc) == 0xe ?
-#endif
-                             (ERROR_sig(uc) >> 1) & 1 : 0,
+                             TRAP_sig(uc) == 0xe ? (ERROR_sig(uc) >> 1) & 1 : 0,
                              &MASK_sig(uc));
 }