Override FetchContent flag to make sure that content is populated. (#1)

This flag now seems to be ON by default in our deb builds but our vendor
packages do not currently pre-populate fetchcontent contents.

I'm applying this patch at the template level assuming that even if it does
not affect Debian as-of bookworm it will in the future and is benign otherwise.

Signed-off-by: Chris Lalancette <[email protected]>

Author: clalancette

debian/rules.em

@@ -35,6 +35,7 @@ override_dh_auto_configure:
 		-DCMAKE_INSTALL_PREFIX="@(InstallationPrefix)" \
 		-DAMENT_PREFIX_PATH="@(InstallationPrefix)" \
 		-DCMAKE_PREFIX_PATH="@(InstallationPrefix)" \
+		-DFETCHCONTENT_FULLY_DISCONNECTED=OFF \
 		$(BUILD_TESTING_ARG)
 
 override_dh_auto_build: