Fix building for "Linux Process" in non-FHS environments

[MadnessASAP]

This PR addresses building the Klipper "Linux Process" MCU on filesystem layouts that don't adhere to the FHS standard (i.e. NixOS) . It replaces the absolute include paths in main.c and gpio.c with relative paths. It also adjusts CFLAGS to use -iquote to prevent conflicts when resolving quoted "includes" and .

The finest of "builds for me" testing was carried out successfully.

[CRTified]

Thanks, I just looked into setting up the host MCU and ran into this issue. This PR fixed compilation for me :)

[MadnessASAP]

Thanks, I just looked into setting up the host MCU and ran into this issue. This PR fixed compilation for me :)

Glad it helped, are you also running on NixOS by chance? I'm also putting some TLC into the nixpkg module.

[CRTified]

are you also running on NixOS by chance?

Yes, I am. Feel free to ping me on matrix (@crtified:crtified.me), I got the host mcu working on NixOS already :)

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[cnf]

Discord Link to a discussion about this.

[KevinOConnor]

Thanks. It seems fine to me. Could you split the line in the Makefile so it does not exceed 80 characters though?

-Kevin

[MadnessASAP]

Thanks! Makefile corrected for the non-ultrawide proletariat.

[KevinOConnor]

Thanks.

-Kevin