pkg/45977: xmkmf is not defined as a platform tool on IRIX (with native X11)

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>Number:         45977
>Category:       pkg
>Synopsis:       xmkmf is not defined as a platform tool on IRIX (with native 
>X11)
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 10 19:35:00 +0000 2012
>Originator:     duck+important%shangtai.net@localhost
>Release:        pkgsrc-2011Q3
>Organization:
>Environment:
System: IRIX64 halo 6.5 6.5.29m 01090133 IP30
Architecture: mipseb
Machine: IP30
>Description:
When attempting to build xpkgwedge, I noticed it kept attempting to pull in
imake even though TOOLS_PLATFORM.imake was properly set. It turned out that
TOOLS_PLATFORM.xmkmf was not set and thus caused imake to be pulled in (along
with early bits of Xorg before I stopped it)
>How-To-Repeat:
Attempt to build a package that needs xmkmf on IRIX
>Fix:
Add PLATFORM_TOOLS.xmkmf=/usr/bin/X11/xmkmf to mk/tools/tools.IRIX.mk