scripts/coverity-scan: Remove flex/bison packages

QEMU does not use flex/bison packages.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20200515163029.12917-6-philmd@redhat.com>

scripts/coverity-scan/coverity-scan.docker

@@ -19,7 +19,6 @@ FROM fedora:30
 ENV PACKAGES \
     alsa-lib-devel \
     bc \
-    bison \
     brlapi-devel \
     bzip2 \
     bzip2-devel \
@@ -30,7 +29,6 @@ ENV PACKAGES \
     dbus-daemon \
     device-mapper-multipath-devel \
     findutils \
-    flex \
     gcc \
     gcc-c++ \
     gettext \