Fix typo

Author: oech3

util/build-gnu.sh

@@ -130,7 +130,7 @@ else
 fi
 cd -
 
-# While we support system missing libselinux, we still tun tests for runcon
+# While we support system missing libselinux, we still run tests for runcon
 cargo build --profile="${UU_MAKE_PROFILE}" -p uu_runcon
 # Pass the feature flags to make, which will pass them to cargo
 "${MAKE}" PROFILE="${UU_MAKE_PROFILE}" CARGOFLAGS="${CARGO_FEATURE_FLAGS}"