Remove obsolete <linux/capabilities.h> workarounds.

We've updated the glibc header (and musl will just use the bionic uapi
headers), so this is obsolete (and getting in the way of someone trying
to use the PERFMON capability).

Test: treehugger
Change-Id: Ife7ee076179e1db6246738aa41c2b82bd8546265
2 files changed