Bug 1432410 - Add tests in tree to make sure we don't regress with clang-tidy on static-analisys. Tests wrote in part by :sylvestre. r=gps

MozReview-Commit-ID: IWxzKfWNIHG

tools/clang-tidy/test/clang-analyzer-security.insecureAPI.getpw.cpp

@@ -0,0 +1,6 @@
+#include "structures.h"
+
+void test() {
+  char buff[1024];
+  getpw(2, buff);
+}