update net/radvd to 1.15

[farrokhi]

Summary

• update net/radvd to 1.15
• cleanup Makefile
• take maintainership

[mat]

net/radvd/Makefile

22–24 ↗

(On Diff #8286)

Remove the trailing / on each lines, they serve no purpose, and sometime confuse people. You can also un-mute the directory creation.

[farrokhi]

• tidy up Makefile

[mat]

I'm not sure the patch really needs updating just to change (0) to 0, but you must know better :-)