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libjson: handle unicode escapes

--- a/sys/src/libjson/json.c

+++ b/sys/src/libjson/json.c

@@ -52,6 +52,8 @@

 {

 	Rune r;

 	char *t;

+	int i;

+	char c;

 	for(;;){

 		r = peekch(l);

@@ -116,6 +118,19 @@

 					break;

 				case 'r':

 					r = '\r';

+					break;

+				case 'u':

+					r = 0;

+					for(i = 0; i < 4; i++){

+						if(!isxdigit(peekch(l)))

+							break;

+

+						c = getch(l);

+						r *= 16;

+						if(c > '0' && c < '9') r += c - '0';

+						else if(c > 'a' && c < 'f') r += c - 'a' + 10;

+						else if(c > 'A' && c < 'F') r += c - 'A' + 10;

+					}

 					break;

 				case 't':

 					r = '\t';