CMake: Install bash completions via cmake

Having the completions installed only by the packaging was
an oversight.

Gbp-Dch: ignore

CMakeLists.txt

@@ -133,6 +133,7 @@ add_subdirectory(apt-pkg)
 add_subdirectory(apt-private)
 add_subdirectory(apt-inst)
 add_subdirectory(cmdline)
+add_subdirectory(completions)
 add_subdirectory(doc)
 add_subdirectory(dselect)
 add_subdirectory(ftparchive)

completions/CMakeLists.txt

@@ -0,0 +1,4 @@
+set(BASH_COMPLETION_DIR "${CMAKE_INSTALL_DATAROOTDIR}/bash-completion/completions"
+    CACHE PATH "Path to the bash-completion completions directory")
+
+install(FILES bash/apt DESTINATION ${BASH_COMPLETION_DIR})

debian/apt.install

@@ -29,7 +29,7 @@ usr/share/man/*/*/apt-mark.*
 usr/share/man/*/*/apt-secure.*
 usr/share/man/*/*/sources.list.*
 usr/share/man/*/*/apt_preferences.*
-completions/bash/* /usr/share/bash-completion/completions/
+usr/share/bash-completion/completions/
 debian/*.service /lib/systemd/system/
 debian/*.timer /lib/systemd/system/
 usr/lib/apt/apt-helper