kbuild,bpf: Pass make jobs' value to pahole

Pass the value of make's -j/--jobs argument to pahole, to avoid out of
memory errors and make pahole respect the "jobs" value of make.

On systems with little memory but many cores, invoking pahole using -j
without argument potentially creates too many pahole instances,
causing an out-of-memory situation. Instead, we should pass make's
"jobs" value as an argument to pahole's -j, which is likely configured
to be (much) lower than the actual core count on such systems.

If make was invoked without -j, either via cmdline or MAKEFLAGS, then
JOBS will be simply empty, resulting in the existing behavior, as
expected.

Signed-off-by: Florian Schmaus <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Tested-by: Holger Hoffstätte <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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