Remove related man pages gz logic as it's removed in new version [1].
[1] 2169de66ec
Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
(cherry picked from commit f2748082e84b70c0a73d7d494b0f02338fedded1)
Signed-off-by: Armin Kuster <akuster808@gmail.com>