QmakeProjectImporter: Prepare for multiple concurrent imports

Fix logic around temporary qt versions. We want essentially shared
ownership of kits on the temporary qt version.

Change-Id: Ic8c748aa2b04afb5a30444563b3fc2f4272ca47c
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/libs/utils/algorithm.h

@@ -64,6 +64,12 @@ bool anyOf(const T &container, F predicate)
     return std::any_of(container.begin(), container.end(), predicate);
 }
 
+template<typename T, typename F>
+int count(const T &container, F predicate)
+{
+    return std::count_if(container.begin(), container.end(), predicate);
+}
+
 //////////////////
 // allOf
 /////////////////