further small changes to elminate most of the remaining warnings.

* error.c trionan.[ch] testThreads.c python/generator.py:
  further small changes to elminate most of the remaining
  warnings.
diff --git a/testThreads.c b/testThreads.c
index 1479d8d..24633ee 100644
--- a/testThreads.c
+++ b/testThreads.c
@@ -84,7 +84,7 @@
 }
 
 int
-main()
+main(void)
 {
     unsigned int i, repeat;
     unsigned int num_threads = sizeof(testfiles) / sizeof(testfiles[0]);