The latest commit breaks static building on macOS

[KitsuneRal]

CI for libQuotient breaks when using QtKeychain as of commit e5eeb17 (itself being a fix of #209):
https://github.com/quotient-im/libQuotient/runs/6652144889
Building exactly the same code with QtKeychain 0.13.2 goes fine:
https://github.com/quotient-im/libQuotient/runs/6656099298