Stop using deprecated reset?Stream functions

These are replaced by the corresponding context resets. When
converting resetCStream, CCtx_setPledgedSrcSize isn't called if the
source size is "unknown".

This helps reduce the reliance on "static only" symbols, as well as
reducing the use of deprecated functions.

Signed-off-by: Stephen Kitt <steve@sk2.org>

programs/fileio.c

@@ -2109,7 +2109,7 @@ FIO_decompressZstdFrame(FIO_ctx_t* const fCtx, dRess_t* ress, FILE* finput,
         if (srcFileLength>20) srcFileName += srcFileLength-20;
     }
 
-    ZSTD_resetDStream(ress->dctx);
+    ZSTD_DCtx_reset(ress->dctx, ZSTD_reset_session_only);
 
     /* Header loading : ensures ZSTD_getFrameHeader() will succeed */
     {   size_t const toDecode = ZSTD_FRAMEHEADERSIZE_MAX;