* libltp/include/test.h: Fix C warnings.

* winsup.api/checksignal.c: Ditto.
* winsup.api/crlf.c: Ditto.
* winsup.api/devzero.c: Ditto.
* winsup.api/iospeed.c: Ditto.
* winsup.api/mmaptest01.c: Ditto.
* winsup.api/mmaptest02.c: Ditto.
* winsup.api/mmaptest03.c: Ditto.
* winsup.api/mmaptest04.c: Ditto.
* winsup.api/nullgetcwd.c: Ditto.
* winsup.api/sigchld.c: Ditto.
* winsup.api/signal-into-win32-api.c: Ditto.
* winsup.api/systemcall.c: Ditto.
* winsup.api/waitpid.c: Ditto.
* winsup.api/pthread/mainthreadexits.c: Ditto.
* winsup.api/pthread/test.h: Ditto.
* winsup.api/pthread/threadidafterfork.c: Ditto.
* Makefile.in: Remove cygrun.exe from RUNTIME since it is built here now.

winsup/testsuite/winsup.api/devzero.c

@@ -1,12 +1,14 @@
 #include <stdio.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 
-main()
+int
+main(int argc, char **argv)
 {
-  int fd, r, w, l;
+  int fd, r, l;
   char buf[1024];
   char *v;