More waf magic in order to please both waf and qt resource generation

According to docs, resources specified in qrc file MUST be relative to
qrc file and there is no way around.  Previously generated qrc file was
only in build/ directory.

Change-Id: I5cf12fc9c184a1ce8a29075edd3da60b433e05cd
diff --git a/.gitignore b/.gitignore
index 53e0e87..176dcee 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,4 @@
 osx/Frameworks/Sparkle.framework
 Sparkle*
 *priv.pem
+gui/html.qrc