QbsProjectManager: Fix Windows build.

The qbs DLL must end up in bin/ in order to be found by the plugin.

Change-Id: Ie81e7550aa51f3414d829c893ad03dcafcc9c7fc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

qtcreator.pro

@@ -19,6 +19,14 @@ OTHER_FILES += dist/copyright_template.txt \
     qtcreator.qbp \
     qbs/pluginspec/pluginspec.qbs
 
+qmake_cache = $$targetPath($$IDE_BUILD_TREE/.qmake.cache)
+unix: maybe_quote = \"
+system("echo $${maybe_quote}$${LITERAL_HASH} config for qmake$${maybe_quote} > $$qmake_cache")
+# Make sure the qbs dll ends up alongside the Creator executable.
+win32:exists(src/shared/qbs/qbs.pro) {
+    system("echo QBS_DLLDESTDIR = $${IDE_BUILD_TREE}/bin >> $$qmake_cache")
+}
+
 contains(QT_ARCH, i386): ARCHITECTURE = x86
 else: ARCHITECTURE = $$QT_ARCH