Workaround for hanging benchmarks

The alarm signal is not delivered unless we call some kernel function.

Author: th-otto

crypt/speeds.c

@@ -11,6 +11,7 @@
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <sched.h>
 
 /* Some modifications for the MiNTLib.  Especially also test MD5
    encryption.  */
@@ -159,6 +160,7 @@ main ()
 #else
 	s = crypt (s, SALT);
 #endif
+	sched_yield();
     }
 
   return 1;

time/test-clock.c

@@ -3,6 +3,7 @@
 #include <time.h>
 #include <unistd.h>
 #include <stdlib.h>
+#include <sched.h>
 
 volatile int gotit = 0;
 
@@ -27,7 +28,7 @@ main (int argc, char ** argv)
     }
   alarm(1);
   start = clock ();
-  while (!gotit);
+  while (!gotit) sched_yield();
   stop = clock ();
 
   printf ("%ld clock ticks per second (start=%ld,stop=%ld)\n",