Add newline at the end of the files. Add -Wno-unused-command-line-argument to programs compilation flow, to support clang.

programs/tests/t_sigmask.c

@@ -46,4 +46,4 @@ int main(int argc, char *argv[])
     printf("main : Returning from handler (%d): %d.\n", SIGUSR1, ret);
 
     return 0;
-}
+}