Fix qbs build.

Was broken by commit 533644290f.

Change-Id: I70753cdbfcc21333ab88657d7f0db03fd868f71f
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/valgrind/valgrind.qbs

@@ -8,6 +8,7 @@ QtcPlugin {
     Depends { name: "Qt"; submodules: ["widgets", "network"] }
     Depends { name: "Core" }
     Depends { name: "AnalyzerBase" }
+    Depends { name: "Debugger" }
     Depends { name: "ProjectExplorer" }
     Depends { name: "TextEditor" }
     Depends { name: "RemoteLinux" }