add python3-cffi to depedencies

diff --git a/install-hdl-apt-reqs b/install-hdl-apt-reqs
index b46a44ac8c4c22b0262257ac469251fa66b2532e..c8c547201ab86ab88d00d9011c9d1b2e6cff9311 100755 (executable)
--- a/install-hdl-apt-reqs
+++ b/install-hdl-apt-reqs
@@ -55,6 +55,7 @@ apt-get install -y autoconf \
     python3-setuptools \
     python-svgwrite \
     python3-svgwrite \
+    python3-cffi \
     python3-venv \
     python3-sphinx \
     python3-sphinx-rtd-theme \