fix(build): Don't build hello-freertos because old meson

Signed-off-by: Rahix <rahix@rahix.de>

hw-tests/meson.build

@@ -4,7 +4,8 @@ subdir('bmatest/')
 subdir('bmetest/')
 subdir('dual-core/')
 subdir('ecgtest/')
-subdir('hello-freertos/')
+# Disabled due to meson bug in older version
+# subdir('hello-freertos/')
 subdir('hello-world/')
 subdir('imutest/')
 subdir('ips/')