ci+docs: switch to pkgconf on macOS

Change-Id: I9cb98823c41974d37257c72f67693c2ebce23db8
diff --git a/.jenkins.d/00-deps.sh b/.jenkins.d/00-deps.sh
index b0e54a0..17b544a 100755
--- a/.jenkins.d/00-deps.sh
+++ b/.jenkins.d/00-deps.sh
@@ -18,7 +18,7 @@
     pkg-config
     python3
 )
-FORMULAE=(boost openssl pkg-config)
+FORMULAE=(boost openssl pkgconf)
 PIP_PKGS=()
 case $JOB_NAME in
     *code-coverage)