f0cf445 fix missing build deps, enable libproxy, sctp

Authored and Committed by loise a year ago
    fix missing build deps, enable libproxy, sctp
    
    Attached fix uses doubleconversion system libs (like qt6-qtbase), adds the missing sctp build requires to build with sctp enabled and enables libproxy where the buildrequires already existed and enables sctp to enable all qt network features.
        
file modified
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