merge multi threading to master branch

- updated zstd to latest devel release
- lz4, lz5 and zstd is included now
- all three support threading

CPP/7zip/Bundles/Codec_lz4/makefile

@@ -0,0 +1,36 @@
+PROG = lz4.dll
+DEF_FILE = ../../Compress/Codec.def
+CFLAGS = $(CFLAGS) -DNEED_7ZIP_GUID
+
+7ZIP_COMMON_OBJS = \
+  $O\StreamUtils.obj \
+
+WIN_OBJS = \
+  $O\System.obj \
+
+COMPRESS_OBJS = \
+  $O\CodecExports.obj \
+  $O\DllExportsCompress.obj \
+
+C_OBJS = \
+  $O\Alloc.obj \
+  $O\Threads.obj \
+
+COMPRESS_OBJS = $(COMPRESS_OBJS) \
+  $O\Lz4Decoder.obj \
+  $O\Lz4Encoder.obj \
+  $O\Lz4Register.obj \
+
+LZ4_OBJS = \
+  $O\lz4.obj \
+  $O\lz4frame.obj \
+  $O\lz4hc.obj \
+  $O\lz4xxhash.obj \
+
+ZSTDMT_OBJS = \
+  $O\lz4mt_common.obj \
+  $O\lz4mt_compress.obj \
+  $O\lz4mt_decompress.obj \
+  $O\threading.obj \
+
+!include "../../7zip.mak"