cirrus-ci: Fix FreeBSD build following QEMU update

QEMU requires ninja and bash to build now.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>

.cirrus.yml

@@ -4,7 +4,7 @@ freebsd_template: &FREEBSD_TEMPLATE
     APPEND_LIB: /usr/local/lib
     APPEND_INCLUDES: /usr/local/include
 
-  install_script: pkg install -y seabios gmake
+  install_script: pkg install -y seabios gmake ninja bash
                                  pkgconf python libiconv bison perl5
                                  yajl lzo2 pixman argp-standalone
                                  libxml2 glib git