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libc: fopen(), allow for example r+b and rb+

--- a/lib/c/_fpopen.c

+++ b/lib/c/_fpopen.c

@@ -14,14 +14,25 @@

 	flags = rw = bin = 0;

-	if (mode[0] == '\0)

+	if (mode[0] == '\0')

 		goto einval;

-	if (mode[i = 1] == '+')

-		i++, rw = 1;

-	if (mode[i] == 'b')

-		i++, bin = 1;

-	if (mode[i] != '\0')

-		goto einval;

+

+	for (i = 1; mode[i]; ++i) {

+		switch (mode[i]) {

+		case '+':

+			if (rw)

+				goto einval;

+			rw = 1;

+			break;

+		case 'b':

+			if (bin)

+				goto einval;

+			bin = 1;

+			break;

+		default:

+			goto einval;

+		}

+	}

 	switch (mode[0]) {

 	case 'a':