perf doc: Define man page date when using asciidoctor

When building perf documentation with asciidoc, we use "git log" to
find the last commit date of each doc source and pass that to asciidoc
to use as the man page date.

When using asciidoctor, however, the current date is always used
instead.  Defining perf_date like we do for asciidoc also doesn't
work because we're not using DocBook as an intermediate format.
The asciidoctor man page backend looks for the variable "docdate",
so set that instead.

Signed-off-by: Ben Hutchings <[email protected]>
Acked-by: Ian Rogers<[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Salvatore Bonaccorso <[email protected]>
Link: https://lore.kernel.org/r/ZF/1BOahN/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

0 files changed, 0 insertions, 0 deletions