[lib][tracing] Add ZSTD_NO_TRACE macro

When defined, it disables tracing, and avoids including the header.

lib/compress/zstd_compress.c

@@ -14,7 +14,6 @@
 #include "../common/zstd_deps.h"  /* INT_MAX, ZSTD_memset, ZSTD_memcpy */
 #include "../common/cpu.h"
 #include "../common/mem.h"
-#include "../common/zstd_trace.h"
 #include "hist.h"           /* HIST_countFast_wksp */
 #define FSE_STATIC_LINKING_ONLY   /* FSE_encodeSymbol */
 #include "../common/fse.h"

lib/compress/zstd_compress_internal.h

@@ -19,7 +19,6 @@
 *  Dependencies
 ***************************************/
 #include "../common/zstd_internal.h"
-#include "../common/zstd_trace.h"  /* ZSTD_TraceCtx */
 #include "zstd_cwksp.h"
 #ifdef ZSTD_MULTITHREAD
 #  include "zstdmt_compress.h"