Valgrind: Fix coding style issues.

Header specification, remove internal classes from exported
headers, fully qualify signals,slots.

src/libs/valgrind/valgrindrunner.cpp

@@ -40,7 +40,7 @@
 
 #include <utils/environment.h>
 
-#include <QEventLoop>
+#include <QtCore/QEventLoop>
 
 using namespace Valgrind;
 
@@ -250,4 +250,4 @@ void ValgrindRunner::stop()
 {
     if (d->process)
         d->process->close();
-}
+}