[openib-general] respect CFLAGS in ibis/ibdm, fix missing file warning

[Hal Rosenstock]

On Thu, 2006-01-19 at 16:53, Pete Wyckoff wrote:
> Avoid overriding CFLAGS in ibis and ibdm.  These apply to ibis and
> ibdm below gen2/utils/src/linux-user/.
> 
> The third chunk below avoids a configure warning for a file
> "osm_build_id.h" that appears nowhere in my source or build tree.

osm_build_id.h is a biproduct of the OpenSM build.

-- Hal