fix broken macOS paths for homebrew service #7189
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When Spacemacs is run as a macOS homebrew service, the window-system at startup time is not set as it is running essentially headless. This causes the very-early call to exec-path-from-shell, which was checking for macOS via window-system, to fail the check. This is pretty much game over for macOS and user-customized paths, as the exec paths are not updated and any extra user-path utilities (e.g. aspell, gls) won't be found.
This change switches over to using spacemacs/system-is-mac and spacemacs/system-is-linux as the primary checks, and keeps the window-system check for 'x in case other Unix variants are getting exec-path set via that check.