FIX: several clang warnings fixed

Author: Oldes

src/core/p-file.c

@@ -298,7 +298,7 @@ REBINT Mode_Syms[] = {
 		// append temporary CRLF on Windows or LF on Posix
 		// @@ https://github.com/rebol/rebol-issues/issues/2102
 #ifdef TO_WINDOWS
-		Append_Bytes_Len(VAL_SERIES(data), "\r\n", 2);
+		Append_Bytes_Len(VAL_SERIES(data), cb_cast("\r\n"), 2);
 		n = 2;
 #else
 		Append_Byte(VAL_SERIES(data), '\n');

src/core/t-tuple.c

@@ -189,8 +189,8 @@
 	REBYTE	*vp = NULL;
 	REBYTE	*ap = NULL;
 	REBCNT	len = 0;
-	REBINT	alen;
-	REBINT	v;
+	REBCNT	alen;
+	REBCNT	v;
 	REBINT	a;
 	REBDEC	dec;
 

src/os/win32/dev-event.c

@@ -41,7 +41,7 @@
 #include "reb-host.h"
 #include "host-lib.h"
 
-void Done_Device(int handle, int error);
+void Done_Device(REBUPT handle, int error);
 
 // Move or remove globals? !?
 HWND Event_Handle = 0;			// Used for async DNS