cmake: updated to 3.13.4

Changes in 3.13.4 since 3.13.3:
* Tests: add cases for providing Qt5Core_VERSION manually
* AutoGen: query Qt5 version from directory properties
* Revert "file: Allow DOWNLOAD/UPLOAD using alternate authentication
  methods"
* Intel: Record support for relaxed constexpr by version 18.0.5
* macOS: Restore compatibility for setting FRAMEWORK after install()
* FindLAPACK: Distinguish check result variable name from FindBLAS
* macOS: Add missing explicit dependency on CoreServices framework
* cmake: Convert no source/build dir error to warning
* Help: Add 3.13.4 release note for no source/build dir error/warning
* FindDoxygen: Escape backslashes in default values

(adam)