main/fontconfig: disable test that tries to use internet
test tries to download google fonts from internet:
https://gitlab.freedesktop.org/fontconfig/fontconfig/-/blob/2.15.0/test/run-test.sh#L435
test tries to download google fonts from internet:
https://gitlab.freedesktop.org/fontconfig/fontconfig/-/blob/2.15.0/test/run-test.sh#L435