build: fix for out-of-tree/distdir qt builds

Author: theuni

src/Makefile.qt.include

@@ -354,7 +354,7 @@ endif
 
 RES_IMAGES = 
 
-RES_MOVIES = $(wildcard qt/res/movies/spinner-*.png)
+RES_MOVIES = $(wildcard $(srcdir)/qt/res/movies/spinner-*.png)
 
 BITCOIN_RC = qt/res/bitcoin-qt-res.rc