Reduce GNU Make latency 17% for cosmo

fgets() is now 4x faster which makes Make 2% faster. Landlock Make now
has a builtin $(uniq ...) function that uses critbit trees rather than
functional programming. Since uniq is the most important function this
optimization makes our cold start latency 15% faster.

third_party/make/commands.c

@@ -520,6 +520,7 @@ fatal_error_signal (int sig)
   if (sig == SIGTERM || sig == SIGINT
     || sig == SIGHUP
     || sig == SIGQUIT
+    || sig == SIGPIPE
     )
     {
       struct child *c;