find_package_handle_standard_args: X_FIND_REQUIRED is case sensitive
I've just noticed that with
find_package_handle_standard_args then checks
Foo_FIND_REQUIRED, which was confusing, since otherwise packages appear to be handle case insensitive.
I think it might be good to check this case insensitively - after all it will also use uppercase with
_FPHSA_FAILURE_MESSAGE in Modules/FindPackageHandleStandardArgs.cmake.
Also applies to
_FIND_QUIETLY then probably.