dir: store EXC_FLAG_* values in unsigned integers

The values defined by the macro EXC_FLAG_* (1, 4, 8, 16) are stored
in fields of the structs "pattern" and "exclude", some functions
arguments and a local variable.  None of these uses its most
significant bit in any special way and there is no good reason to
use a signed integer for them.

And while we're at it, document "flags" of "exclude" to explicitly
state the values it's supposed to take on.

Signed-off-by: Saurav Sachidanand <sauravsachidanand@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

attr.c

@@ -124,7 +124,7 @@ struct pattern {
 	const char *pattern;
 	int patternlen;
 	int nowildcardlen;
-	int flags;		/* EXC_FLAG_* */
+	unsigned flags;		/* EXC_FLAG_* */
 };
 
 /*