shims/mac/super: add `pkgconf` symlink #31372

Job	Run time
syntax	48s
formula audit	5m 8s
vendored gems	38s
cask audit	2m 50s
tap syntax	6m 39s
test default formula (Ubuntu 22.04)	1m 25s
tests (online)	5m 32s
test default formula (Ubuntu 20.04)	2m 45s
update-test (Ubuntu)	26s
tests (generic OS)	3m 28s
test default formula (macOS 13 x86_64)	3m 24s
update-test (macOS)	27s
tests (Ubuntu 24.04)	2m 59s
test default formula (macOS 15 arm64)	1m 22s
tests (Ubuntu 22.04)	2m 56s
tests (Ubuntu 20.04)	3m 52s
tests (macOS 13 x86_64)	9m 53s
tests (macOS 15 arm64)	4m 51s
	59m 23s

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