[telegram-desktop/f29] (6 commits) ...Updated to version 1.7.3.

Summary of changes: 7da828c... Switched to special metainfo macro instead of hardcoded pat (*) 1eafaf3... Switched to clang as temporary workaround until GCC regress (*) aff64ec... Use clang compiler only for Fedora 30+. (*) be063b5... Updated changelog entry. (*) 26f0eb0... Updated to 1.7.1 (beta). (*) bdd2e66... Updated to version 1.7.3. (*) This commit already existed in another branch; no separate mail sent