[SRU] Build buttons are never enabled

=== SRU request ===
for karmic

--- Justification ---
Important function for an IDE (building from within the application) does not work. The fix is a 3-line change taken from upstream.

--- Development release ---
Fixed in lucid with version 0.27.4-0ubuntu2

--- How to verify ---
Start qdevelop with no open project and the "build"-button in the build menu is disabled. Make a project from a set of sources for a qt application, eg. the sources for qdevelop itself, and the "build"-button is still disabled.

Using the proposed version the "build"-button is disabled when starting the application without any project open; and the button is enabled when a project is opened.

--- Original bug description ---
Build or compile buttons in QDevelop are always disabled since upgrading to Karmic. This seems to be a well known bug in QDevelop ( see at http://code.google.com/p/qdevelop/issues/detail?id=374&can=1&q=build ).

Karmic uses the package qdevelop 0.27.4-0ubuntu1 and also Jaunty uses a package qdevelop 0.27.4-0ubuntu1 but i did not have this bug in Jaunty.

ProblemType: Bug
Architecture: i386
Date: Mon Nov 2 22:23:25 2009
DistroRelease: Ubuntu 9.10
Package: qdevelop 0.27.4-0ubuntu1
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: qdevelop
Uname: Linux 2.6.31-14-generic i686