rtty: clean the source code

Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>

utils/rtty/Makefile

@@ -9,11 +9,11 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rtty
 PKG_VERSION:=7.1.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL=https://github.com/zhaojh329/rtty/releases/download/v$(PKG_VERSION)
-PKG_HASH:=05cc5fcf126041f3bc79d92123ff2a19da25806f77fc12286498ee85da139a74
+PKG_HASH:=72ff1b7abd8e6c7f395a024125135d69ca2a24aa0dbdc3e974a0bc7adb477214
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=MIT