Include Homebrew in PATH for build tool to find go

[keeshux]

Fixes this opaque error when building WireGuardGoBridge, due to Xcode not finding the go binary in PATH:

Command ExternalBuildToolExecution failed with a nonzero exit code

[mludi]

You can easily add the PATH to the Developer.xcconfig

Just add

PATH = ${PATH}:/usr/local/go/bin and it's done.

[alessionossa]

I would add this as a suggestion in README.md, as not everyone has the go binary in the same location, as demonstrated by the @mludi comment in comparison to @keeshux changes.
Something like:

NOTE: You may need to add a line with PATH = ${PATH}:/directory/of/go/binary to the file Config.xcconfig (Sources/WireGuardApp/Config/Config.xcconfig) file.

Markdown syntax

NOTE: You may need to add a line with `PATH = ${PATH}:/directory/of/go/binary` to the file _Config.xcconfig_ (`Sources/WireGuardApp/Config/Config.xcconfig`) file.

[keeshux]

I would add this as a suggestion in README.md, as not everyone has the go binary in the same location, as demonstrated by the @mludi comment in comparison to @keeshux changes. Something like:

NOTE: You may need to add a line with PATH = ${PATH}:/directory/of/go/binary to the file Config.xcconfig (Sources/WireGuardApp/Config/Config.xcconfig) file.

Markdown syntax

True. Personally I would do both as an optimistic strategy, i.e. adding the bit to the README and also falling back to a few default search paths.

PATH = ${PATH}:/opt/homebrew/bin:/usr/local/bin:/usr/local/go/bin