Summary:
I add C API
db/c.cc
rocksdb_sstfilewriter_delete_range

and test it , PASS.
 can you review it ? ajkr

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10314

Reviewed By: riversand963

Differential Revision: D37657236

Pulled By: ajkr

fbshipit-source-id: c3b758daa36fbd9133210b011716914dff311278