Digilent Discovery3 fails on msys2

[ledvinap]

On windows (including msys2 mingw64), sizeof(int)==sizeof(long)==4.
stol will then overflow when parsing periods larger than 2us (< 500Kkz).
https://github.com/glscopeclient/scopehal/blob/master/scopehal/DigilentOscilloscope.cpp#L456C10-L456C10

Replacing stol with stoll fixes windows build, but is a bit of overkill on normal systems (128 bits)

[bvernoux]

Yes just replace it with std::stoll() it returns a 64bits (long long) on any 64bits computer and not 128bits
You can push a PR for that

[ledvinap]

#802