BUILD/MINOR: tools: rename popcount to my_popcountl

This is in order to avoid conflicting with NetBSD popcount* functions
since 6.x release, the final l to mentions the argument is a long like
NetBSD does.

This patch could be backported to 1.5 to fix the build issue there as well.
(cherry picked from commit e6c39416682863d1eaee3acd45ccaadf96f76b12)
2 files changed