[beast] TRAVIS: add build dependency 'gawk' to dockerfile

[Tim Janik <timj src gnome org>]

commit b3a204dbde97b3345bee01a98d0267e4dda762eb
Author: Tim Janik <timj gnu org>
Date:   Fri Apr 1 14:43:55 2016 +0200

    TRAVIS: add build dependency 'gawk' to dockerfile
    
    Signed-off-by: Tim Janik <timj gnu org>

 .travis.docker |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.travis.docker b/.travis.docker
index 31b81e3..9bd40a2 100644
--- a/.travis.docker
+++ b/.travis.docker
@@ -35,7 +35,7 @@ RUN retry apt-get -y install apt-transport-https ca-certificates && \
 # Provide build essentials and dependencies
 RUN retry apt-get install -y \
     build-essential devscripts lintian automake autoconf autoconf-archive libtool intltool git xvfb 
libxml-parser-perl \
-    bison flex cython doxygen graphviz texlive-binaries pandoc \
+    gawk bison flex cython doxygen graphviz texlive-binaries pandoc \
     libcairo2-dev libcroco3-dev libpango1.0-dev python2.7-dev libxml2-dev libgdk-pixbuf2.0-dev 
libreadline6-dev \
     libreadline-dev python-all-dev \
     libasound2-dev libflac-dev libvorbis-dev libmad0-dev libgnomecanvas2-dev libxml2-utils guile-1.8-dev