move a bunch of tests from testcode/lib to test/val (and a failing one to test/todo)

test/val/signal-test.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+
+
+void __fastcall__ sighandler (int sig)
+{
+    printf ("Got signal #%d\n", sig);
+}
+
+
+
+int main (void)
+{
+    if (signal (SIGSEGV, sighandler) == SIG_ERR) {
+        printf ("signal failure %d: %s\n", errno, strerror (errno));
+        return 1;
+    }
+    printf ("About to raise SIGSEGV...\n");
+    raise (SIGSEGV);
+    printf ("Back from signal handler\n");
+    printf ("About to raise SIGILL...\n");
+    raise (SIGILL);
+    printf ("Back from signal handler\n");
+    return 0;
+}
+
+