Remove unused coverity_model.c

coverity_model.c

-/* Coverity Scan model
- *
- * This is a modeling file for Coverity Scan. Modeling helps to avoid false
- * positives.
- *
- * - A model file can't import any header files.
- * - Therefore only some built-in primitives like int, char and void are
- *   available but not wchar_t, NULL etc.
- * - Modeling doesn't need full structs and typedefs. Rudimentary structs
- *   and similar types are sufficient.
- * - An uninitialized local pointer is not an error. It signifies that the
- *   variable could be either NULL or have some data.
- *
- * Coverity Scan doesn't pick up modifications automatically. The model file
- * must be uploaded by an admin in the analysis settings of
- * https://scan.coverity.com/projects/200
- */
-
-/* empty modeling file for now */