[MSVC] added possible to compile at Microsoft Visual C compiler.

[main.c] removed including of unistd.h from c/main.c file.
[blake3_avx2.c|blake3_avx512.c|blake3_sse41.c] resolved compile error:
'C4146' - applying of unary minus operator to the unsigned value.

1 files changed, 0 insertions, 1 deletions

diff --git a/c/main.c b/c/main.c
index 9fe59dd..fff3c22 100644
--- a/c/main.c
+++ b/c/main.c
@@ -10,7 +10,6 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
 
 #include "blake3.h"
 #include "blake3_impl.h"