mingw-w64-libftdi and mingw-w64-libusb-1.0 packages need relocatable config files

[cr1901]

Description / Steps to reproduce the issue

I ran into an issue build openFPGAloader a few weeks ago, where the cmake configuration is told to find libftdi and libusb-1.0's includes/libraries at the hardcoded root /mingw64 prefix. By the time code is compiled, neither cmake or the build tool has converted the Cygwin-based /mingw64 into "an actual path on the filesystem", so gcc cannot find any includes/libraries.

I don't have time to champion this myself right now. But since I know the problem and solution, I should at least document it.

Expected behavior

libftdi's LibFTDI1Config.cmake and libusb-1.0's libusb-1.0.pc files need to be made relocatable.

Actual behavior

libftdi's LibFTDI1Config.cmake and libusb-1.0's libusb-1.0.pc files are hardcoded to use /mingw64 root.

Verification

• I have verified that my MSYS2 is up-to-date before submitting the report (see https://www.msys2.org/docs/updating/)

Windows Version

MINGW64_NT-10.0-19045

MINGW environments affected

• MINGW64
• MINGW32
• UCRT64
• CLANG64
• CLANGARM64

Are you willing to submit a PR?

Maybe later.