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Brad King authored
In commit dc688857 (Pass EXCLUDE_FROM_ALL from directory to targets, 2019-01-15, v3.14.0-rc1~83^2) all `AddNewTarget` call sites were updated to copy the directory-level `EXCLUDE_FROM_ALL` into the target property of the same name, except that the one for `include_external_msproject` was incorrectly missed. Add it now. Furthermore, refactoring in commit b99129d2 (ENH: some code cleanup, 2007-03-12, v2.6.0~2020) accidentally set the `EXCLUDE_FROM_ALL` target property of `include_external_msproject`-generated targets to `FALSE` instead of simply leaving it unset. This was not necessary but had no effect until the above commit gave it a meaning. Drop that. Fixes: #18986
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