tools/sdimage: update to latest git version

This includes code cleanups and fixes some portability issues,
compiler warnings about printf arguments etc.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

tools/sdimage/Makefile

@@ -11,9 +11,9 @@ PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/mhei/fsl-imx-uuc.git
-PKG_SOURCE_DATE:=2016-01-10
-PKG_SOURCE_VERSION:=d395b310b6c0f41ab1302242a639e7d0d7767207
-PKG_MIRROR_HASH:=d67ec9d509201511bc7cba9f7551baa729361817f97390f7c5cbb99b5a7b89b1
+PKG_SOURCE_DATE:=2018-11-18
+PKG_SOURCE_VERSION:=c6536ac5b4388b33c217bde2c3a76a4e96d64176
+PKG_MIRROR_HASH:=747fb640a0596cab7d516979188e1f85be58c470df85cf1f7e3dcf8a4c1b36e5
 
 PKG_LICENSE:=GPL-2.0+
 PKG_LICENSE_FILES:=LICENSE