added constant ZSTD_WINDOWLOG_LIMIT_DEFAULT

answering #1407.

Also : removed obsolete function ZSTD_setDStreamParameter()
which could only be used with one parameter (DStream_p_maxWindowSize).
Now replaced by ZSTD_DCtx_setWindowSize() (which exists since a few revisions)

lib/dll/libzstd.def

@@ -78,7 +78,6 @@ EXPORTS
     ZSTD_nextSrcSizeToDecompress
     ZSTD_resetCStream
     ZSTD_resetDStream
-    ZSTD_setDStreamParameter
     ZSTD_sizeof_CCtx
     ZSTD_sizeof_CDict
     ZSTD_sizeof_CStream