RFE: support per-program noinst_HEADERS

[Chris Pickett]

Hi,

(Please CC me in any reply, I am not subscribed.)

I would like to be able to use noinst_prog_HEADERS, but with 1.10.1 I 
get a complaint about noinst_progdir not being defined:

`noinst_prog_HEADERS' is used but `noinst_progdir' is undefined

I can work around this like this:

noinst_progdir =

but I also think it would be nice if Automake supported this form of 
noinst_HEADERS.

Cheers,
Chris