Bugfix/Issue 1930: Fixed type from char to int

[martinjankoehler]

Fixes issue #1930

[klayoutmatthias]

Ah, the famous "char is signed or unsigned" problem :)

I thought that has been settled as clang and gcc treat it the signed on both Linux and Windows, but ARM appears to be an exception.

Usually I try to avoid that, but here it escaped me. "signed char" would have solved the issue too, but now we're prepared for line widths >=128. Lovely :)

Thanks for the patch.

Best regards,

Matthias

[klayoutmatthias]

P.S. I don't know why, but the Azure builds are randomly failing while trying to download the Windows build bits.