[analyzer] Fix a crash in SyntaxCString checker when given a custom strncat.

Fixes PR13476

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179228 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/cstring-syntax-cxx.cpp b/test/Analysis/cstring-syntax-cxx.cpp
index bae3d0a..39c978a 100644
--- a/test/Analysis/cstring-syntax-cxx.cpp
+++ b/test/Analysis/cstring-syntax-cxx.cpp
@@ -15,3 +15,8 @@
   X c = a + b;
 }
 
+// Ensure we don't crash on custom-defined strncat.
+char strncat ();
+int main () {
+  return strncat ();
+}
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