build+ci: support CentOS Stream 9 and macOS/arm64

This commit also syncs the CI config and scripts with ndn-cxx

Change-Id: Ie46b1d4b299bc95b03aa05d48efe366e1c72d54d
diff --git a/wscript b/wscript
index b223288..a574ada 100644
--- a/wscript
+++ b/wscript
@@ -46,7 +46,12 @@
 
     conf.env.WITH_TESTS = conf.options.with_tests
 
-    conf.find_program('dot', var='DOT', mandatory=False)
+    conf.find_program('dot', mandatory=False)
+
+    # Prefer pkgconf if it's installed, because it gives more correct results
+    # on Fedora/CentOS/RHEL/etc. See https://bugzilla.redhat.com/show_bug.cgi?id=1953348
+    # Store the result in env.PKGCONFIG, which is the variable used inside check_cfg()
+    conf.find_program(['pkgconf', 'pkg-config'], var='PKGCONFIG')
 
     pkg_config_path = os.environ.get('PKG_CONFIG_PATH', f'{conf.env.LIBDIR}/pkgconfig')
     conf.check_cfg(package='libndn-cxx', args=['libndn-cxx >= 0.8.0', '--cflags', '--libs'],