update jamulus to 3.9.0

jamulus/Dockerfile

@@ -1,4 +1,4 @@
-ARG JAMULUS_VERSION=r3_6_1
+ARG JAMULUS_VERSION=r3_9_0
 
 FROM debian:buster-backports AS build-stage
 
@@ -8,14 +8,14 @@ RUN apt-get update \
   && apt-get install -y \
       build-essential \
       qt5-qmake \
-      qtdeclarative5-dev \
       qt5-default \
+      libjack-jackd2-dev \
       qttools5-dev-tools \
       wget
-RUN wget https://github.com/corrados/jamulus/archive/$JAMULUS_VERSION.tar.gz
+RUN wget https://github.com/jamulussoftware/jamulus/archive/$JAMULUS_VERSION.tar.gz
 RUN tar xzf $JAMULUS_VERSION.tar.gz
 RUN cd jamulus-$JAMULUS_VERSION \
-  && qmake "CONFIG+=nosound headless noupcasename" Jamulus.pro \
+  && qmake "CONFIG+=serveronly headless noupcasename" Jamulus.pro \
   && make
 
 FROM scratch