build: fix out-of-tree 'make deploy' for osx

The plist is generated, lives in builddir.

Makefile.am

@@ -28,7 +28,7 @@ OSX_DSSTORE_GEN=$(top_srcdir)/contrib/macdeploy/custom_dsstore.py
 OSX_DEPLOY_SCRIPT=$(top_srcdir)/contrib/macdeploy/macdeployqtplus
 OSX_FANCY_PLIST=$(top_srcdir)/contrib/macdeploy/fancy.plist
 OSX_INSTALLER_ICONS=$(top_srcdir)/src/qt/res/icons/bitcoin.icns
-OSX_PLIST=$(top_srcdir)/share/qt/Info.plist #not installed
+OSX_PLIST=$(top_builddir)/share/qt/Info.plist #not installed
 OSX_QT_TRANSLATIONS = da,de,es,hu,ru,uk,zh_CN,zh_TW
 
 DIST_DOCS = $(wildcard doc/*.md) $(wildcard doc/release-notes/*.md)