cygwin 1.7 build fixes

It's less accepting of signed char ... insisting that e.g. tolower()
not receive one as a parameter.

It's probably good to phase out such usage, given the number of bugs
that lurk in the vicinity (assumptions that char is unsigned), so fix
these even though such usage is actually legal.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

src/server/tcl_server.c

@@ -88,7 +88,7 @@ static int tcl_input(struct connection *connection)
 	const char *result;
 	int reslen;
 	struct tcl_connection *tclc;
-	char in[256];
+	unsigned char in[256];
 
 	rlen = read_socket(connection->fd, &in, sizeof(in));
 	if (rlen <= 0) {