some targets do not define the _REDIR_TIME64 macro resulting in a build error regression sinceddfe5678a4fix by checking if the macro is defined [1] https://github.com/openwrt/openwrt/issues/12587 Fixes: #12587 Fixes:ddfe5678a4("fortify-headers: fix inconsistent time_t version of ppoll") Signed-off-by: Georgi Valkov <gvalkov@gmail.com> (cherry picked from commit9145c4fbcb)