Set collada_dom version before finding the package

The package cmake config uses wrong variables for minor and major versions. They
should be collada_dom_VERSION_MINOR and collada_dom_VERSION_MAJOR but they are
COLLADA_DOM_VERSION_MINOR and COLLADA_DOM_VERSION_MAJOR. CMake variables are
case sensitive so used variables are just empty strings. Set them manually as a
workaround.

CI/install_debian_deps.sh

@@ -25,7 +25,7 @@ declare -rA GROUPED_DEPS=(
   "
 
   # These dependencies can alternatively be built and linked statically.
-  [openmw-deps-dynamic]="libmygui-dev libopenscenegraph-dev libsqlite3-dev"
+  [openmw-deps-dynamic]="libmygui-dev libopenscenegraph-dev libsqlite3-dev libcollada-dom-dev"
   [clang-tidy]="clang-tidy"
 
   # Pre-requisites for building MyGUI and OSG for static linking.

CMakeLists.txt

@@ -265,7 +265,15 @@ set(USED_OSG_PLUGINS
     osgdb_serializers_osg
     osgdb_tga)
 
-find_package(collada_dom)
+if(NOT COLLADA_DOM_VERSION_MAJOR)
+    set(COLLADA_DOM_VERSION_MAJOR 2)
+endif()
+
+if(NOT COLLADA_DOM_VERSION_MINOR)
+    set(COLLADA_DOM_VERSION_MINOR 5)
+endif()
+
+find_package(collada_dom 2.5)
 
 option(OPENMW_USE_SYSTEM_ICU "Use system ICU library instead of internal. If disabled, requires autotools" ON)
 if(OPENMW_USE_SYSTEM_ICU)