Install gettext for audiowmark

See https://github.com/swesterfeld/audiowmark/issues/40

container/Dockerfile.ascn

@@ -22,7 +22,8 @@ RUN apt-get install -y \
     ffmpeg \
     mpg123 \
     vorbis-tools \
-    faac
+    faac \
+    gettext
 
 # ALP-5359 XXX this is kinda hackish:
 # We need a libsndfile fix, but still want the libsndfile package
@@ -34,11 +35,8 @@ RUN apt-get install -y xz-utils curl python3 && \
     make && make install && \
     cd .. && rm -rf libsndfile-1.1.0
 
-# build commit 15b93bf7b16e833b5f00a65d697fae8742b0db8d see
-# https://github.com/swesterfeld/audiowmark/issues/40
 RUN git clone https://code.uplex.de/stefan/audiowmark.git && \
     cd audiowmark && \
-    git checkout 15b93bf7b16e833b5f00a65d697fae8742b0db8d && \
     ./autogen.sh && \
     make && make install && \
     cd .. && rm -rf audiowmark