Move compression level to cctx params

lib/zstd.h

@@ -1013,6 +1013,8 @@ ZSTDLIB_API size_t ZSTD_CCtx_setParameter(ZSTD_CCtx* cctx, ZSTD_cParameter param
 
 ZSTDLIB_API size_t ZSTD_CCtxParam_setParameter(ZSTD_CCtx_params* params, ZSTD_cParameter param, unsigned value);
 
+ZSTDLIB_API size_t ZSTD_CCtx_applyCCtxParams(ZSTD_CCtx* cctx, ZSTD_CCtx_params* params);
+
 /*! ZSTD_CCtx_setPledgedSrcSize() :
  *  Total input data size to be compressed as a single frame.
  *  This value will be controlled at the end, and result in error if not respected.