Add option to not clone aseprite/strings.git during the build

[vigress8]

If Aseprite finds git during the build, it tries to clone the strings repo, which is undesirable if it's e.g. already cloned manually. I maintain a build script which runs in an environment without an internet connection by default, so I had to patch out this behaviour:
https://github.com/pacstall/pacstall-programs/blob/30d70ece43b0bca6048bd774b517e25e5e849a6a/packages/aseprite/dont-clone-strings.patch

Adding a cmake flag for this would be useful

[dacap]

Hi @vigress8, could you test if using FETCHCONTENT_FULLY_DISCONNECTED:BOOL=ON option does fix your issue?

[vigress8]

Hi @vigress8, could you test if using FETCHCONTENT_FULLY_DISCONNECTED:BOOL=ON option does fix your issue?

Yep, it does. Thanks, not very knowledgeable on CMake. You're free to close this if you wish