Does not compile due to issues with HID

For the last few days the builds have been failing with: ``` /home/whitequark/Projects/scopehal-apps/lib/scopehal/SCPIHIDTransport.cpp: In static member function ‘static std::vector<TransportEndpoint> SCPIHIDTransport::EnumTransportEndpoints()’: /home/whitequark/Projects/scopehal-apps/lib/scopehal/SCPIHIDTransport.cpp:171:29: error: ‘EnumerateDevices’ is not a member of ‘HID’ 171 | auto devices = HID::EnumerateDevices(); | ^~~~~~~~~~~~~~~~ ``` I have not investigated why, but I think all of the submodules are up to date at least.