FILPATHLEN is now HAMLIB_FILPATHLEN

[iCounsellorUK]

Reference: https://github.com/Hamlib/Hamlib/blob/master/NEWS

npm fails to install the package because FILPATHLEN has been changed in Hamlib (above).

Temp fix:-

• edit src/hamlib.cpp to change all use of FILPATHLEN to HAMLIB_FILPATHLEN and recompile/make to install.