Limited API: Fix line number reporting in tracebacks that accidentally used...

Limited API: Fix line number reporting in tracebacks that accidentally used 'c_line' instead of 'py_line'. In fact, we cannot currently show the C line, so disable C line reporting completely here.

Cython/Utility/Exceptions.c

@@ -792,9 +792,9 @@ static void __Pyx_AddTraceback(const char *funcname, int c_line,
     if (c_line) {
         // Avoid "unused" warning as long as we don't use this.
         (void) $cfilenm_cname;
-        c_line = __Pyx_CLineForTraceback(__Pyx_PyThreadState_Current, c_line);
+        (void) __Pyx_CLineForTraceback(__Pyx_PyThreadState_Current, c_line);
     }
-    _PyTraceback_Add(funcname, filename, c_line ? -c_line : py_line);
+    _PyTraceback_Add(funcname, filename, py_line);
 }
 #else
 static PyCodeObject* __Pyx_CreateCodeObjectForTraceback(

Cython/Utility/ModuleSetupCode.c

@@ -169,6 +169,10 @@
   #define CYTHON_COMPILING_IN_LIMITED_API 1
   #define CYTHON_COMPILING_IN_GRAAL 0
 
+  // CYTHON_CLINE_IN_TRACEBACK is currently disabled for the Limited API
+  #undef CYTHON_CLINE_IN_TRACEBACK
+  #define CYTHON_CLINE_IN_TRACEBACK 0
+
   #undef CYTHON_USE_TYPE_SLOTS
   #define CYTHON_USE_TYPE_SLOTS 0
   #undef CYTHON_USE_TYPE_SPECS