While libcap-enabled builds check whether any capability named requests
is within the permitted capability set, non-libcap builds just try
requesting them, which potentially causes a misleading error message to
be output ("Operation not permitted: please ensure that the capset
kernel module is loaded"). Ensure non-libcap builds also check whether
any requested capability is within the permitted capability set.
(cherry picked from commit 8c66f32e53)
4b0129f34b