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Brad King authored
Since commit v3.9.0-rc1~309^2 (include_external_msproject: Honor MAP_IMPORTED_CONFIG_<CONFIG>, 2017-04-04) we accidentally honor `MAP_IMPORTED_CONFIG_<CONFIG>` while generating the `.sln` file entries for normal targets. This causes `devenv.com`-driven builds to use the mapping incorrectly for normal targets. Check that a target really comes from `include_external_msproject` before considering the map. Furthermore, when we do use the map, we should only take the first entry if more than one configuration is specified. Otherwise we end up giving VS a configuration name with a `;` in it. Fixes: #17276
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