pkg/33940: several packages fail to build because of missing *proto

[j+nbsd%2006.salmi.ch@localhost]

>Number:         33940
>Category:       pkg
>Synopsis:       several packages fail to build because of missing *proto
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 07 15:25:00 +0000 2006
>Originator:     Jukka Salmi
>Release:        NetBSD 3.99.21
>Environment:
System: NetBSD moray.salmi.ch 3.99.21 NetBSD 3.99.21 (MORAY.APM) #0: Wed Jul 5 
20:51:26 CEST 2006 
build%moray.salmi.ch@localhost:/build/nbsd/i386/sys/arch/i386/compile/MORAY.APM 
i386
Architecture: i386
Machine: i386
>Description:
Using today's pkgsrc HEAD sources several packages (e.g. www/firefox,
graphics/hicolor-icon-theme) fail to build because of some *proto
packages are missing (see below).

>How-To-Repeat:
$ cd pkgsrc/graphics/hicolor-icon-theme && make
[...]
===> wrapper-message [hicolor-icon-theme-0.9nb1, gnome-icon-theme-2.14.2nb1] 
===> Creating toolchain wrappers for hicolor-icon-theme-0.9nb1
ERROR: xextproto is not installed; can't buildlink files.
*** Error code 1
[...]

Installing x11/xextproto turns the failure into

> Creating toolchain wrappers for hicolor-icon-theme-0.9nb1
ERROR: xproto is not installed; can't buildlink files.
*** Error code 1

and installing x11/xproto finally fixes it, i.e. makes building
graphics/hicolor-icon-theme succeed.

>Fix: