* How to cross compile libftdi-1.x for Windows? *
1 - Prepare a pkg-config wrapper according to
- https://www.flameeyes.eu/autotools-mythbuster/pkgconfig/cross-compiling.html ,
+ https://autotools.io/pkgconfig/cross-compiling.html ,
additionally export PKG_CONFIG_ALLOW_SYSTEM_CFLAGS and
PKG_CONFIG_ALLOW_SYSTEM_LIBS.
2 - Write a CMake toolchain file according to