Do not download unused submodules for CPM package #964
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CMake let's you define a list of submodules that should be downloaded when fetching remote repos, see ExternalProject docs (same mechanism is used for the FetchContent commands, see here.
For valijson we do not want any submodules to be downloaded, but CPM does not currently parse the option
GIT_SUBMODULES ""correctly. There seems to be issues with handling empty strings.However, there is a workaround: specify an existing subdir from the repo to not download any submodules.
This small change will speed up the CMake config a bit and reduce the size of the build folder, as we skip downloading seven remote projects.