Look for icu4c in the new homebrew location (#10)
Look for icu4c in the new homebrew location (#10)

Homebrew now installs into /opt/homebrew which causes problems for
hardcoded references to /usr/local.

This patch updates the extconf.rb file to use the pkg_config function
of mkmf and adds sets the PKG_CONFIG_PATH environment variable to also
include this new install location.
edporras/edn_turbo,edporras/edn_turbo