dockerfile: remove duplicated yamlcpp
(is installed from upstream later)
@@ -36,7 +36,6 @@ RUN apt-get update \
libpcre++-dev \
libglib2.0-dev \
libxerces-c-dev \
- libyaml-cpp-dev \
qtbase5-dev \
qtdeclarative5-dev \
libmarkdown2-dev \
