qt: Use quint64 for formatServicesStr

`uint64_t` was causing a build error on some systems, as that type is
not known after including just the Qt headers.
Revert "build: add option for reducing exports"

Revert #4663 for now. It still breaks the pulltester.

This reverts commit 4975ae1722cd8af63eda2f02ef64a98091b6fb58.

Conflicts:
	configure.ac