Remove Cirrus CI.

.cirrus.yml

@@ -1,16 +0,0 @@
-env:
-  CIRRUS_CLONE_DEPTH: 1
-  ARCH: amd64
-
-task:
-  freebsd_instance:
-    image: freebsd-12-1-release-amd64
-  install_script:
-    - pkg upgrade -y
-    - pkg install -y gmake pkgconf autotools
-  script:
-    - ./autogen.sh
-    - mkdir tmp
-    - cd tmp
-    - ../configure --enable-lights
-    - gmake -C bld-ks-its