Add missing edges to dependency graph in order to
allow for parallel building.

--- qcodeedit-2.2.3/qcodeedit.pro
+++ qcodeedit-2.2.3/qcodeedit.pro
@@ -4,6 +4,9 @@
 
 SUBDIRS += lib example designer-plugin
 
+example.depends = lib
+designer-plugin.depends = lib
+
 CONFIG(debug, debug|release) {
 	# placeholder
 	QCODE_EDIT_EXTRA_DEFINES += _DEBUG_BUILD_