Switch to debhelper compat level 12.

debian/changelog

@@ -3,6 +3,7 @@ cmake (3.15.4-1) UNRELEASED; urgency=medium
   * New upstream release.
   * Disable FIleAPI json-extra test for now as it doesn't seem critical and
     fails with libjsoncpp 1.7.4.
+  * Switch to debhelper compat level 12.
 
  -- Felix Geyer <fgeyer@debian.org>  Mon, 11 Nov 2019 23:02:00 +0100
 

debian/compat

@@ -1 +0,0 @@
-10

debian/control

@@ -4,7 +4,7 @@ Priority: optional
 Maintainer: Debian CMake Team <pkg-cmake-team@lists.alioth.debian.org>
 Uploaders: Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>,
            Felix Geyer <fgeyer@debian.org>
-Build-Depends: debhelper (>= 10~),
+Build-Depends: debhelper-compat (= 12),
                freebsd-glue [kfreebsd-any],
                libarchive-dev (>= 2.8.0),
                libbz2-dev,

debian/rules

@@ -58,8 +58,8 @@ override_dh_auto_clean:
 	dh_auto_clean
 	rm -f $(BUILD_FLAGS_FILE)
 
-override_dh_install:
+override_dh_missing:
-	dh_install --list-missing
+	dh_missing --list-missing
 
 override_dh_installdocs-arch:
 	# dh_installdocs --link-doc generates binNMU unsafe deps (Bug #747141)