Update to V20181204.

Upstream overhauled part of their repository, making it harder to build
from a tarbal. (need to deal with git submodules)

However, they do ship sha1sums and gpg signatures now, so we use those.

trang

@@ -2,12 +2,14 @@
 
 if [ "$1" = "classpath" ]
 then
-  CP="$2"
+  CLASSPATH="$2"
   shift 2
 fi
 
-for jar in /usr/share/java/trang/*.jar; do
-	CP="$CP:$jar"
-done
+JAVACLASSES=/usr/share/java/trang
+CLASSPATH="${CLASSPATH:-.}:$JAVACLASSES/trang.jar"
+
+export CLASSPATH
+
+exec java com.thaiopensource.relaxng.translate.Driver "$@"
 
-exec java -cp "$CP" com.thaiopensource.relaxng.translate.Driver "$@"