build: require gcc >= 9.1, recommend gcc >= 10.2

Similarly, recommend clang 10 or later. On macOS, the minimum Xcode
version is now 11, while the recommended one is 13 or later.

Change-Id: I6b1b2b9eb16e11c3634a914f881fdbe4aefbc278
diff --git a/.jenkins.d/00-deps.sh b/.jenkins.d/00-deps.sh
index 00530a3..133a373 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)
@@ -34,6 +34,7 @@
 set -x
 
 if [[ $ID == macos ]]; then
+    export HOMEBREW_NO_ENV_HINTS=1
     if [[ -n $GITHUB_ACTIONS ]]; then
         export HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK=1
     fi