add CS_OPT_UNSIGNED option to print immediate in unsigned form. only ARM is supported for now (issue #585)
diff --git a/cs.c b/cs.c
index 8f22d7b..ebd8109 100644
--- a/cs.c
+++ b/cs.c
@@ -423,6 +423,10 @@
 		default:
 			break;
 
+		case CS_OPT_UNSIGNED:
+			handle->imm_unsigned = (cs_opt_value)value;
+			return CS_ERR_OK;
+
 		case CS_OPT_DETAIL:
 			handle->detail = (cs_opt_value)value;
 			return CS_ERR_OK;