New comment by q66 on void-packages repository

https://github.com/void-linux/void-packages/pull/14701#issuecomment-535279104

Comment:
Looks like `qt5dxcb-plugin` needs this:

```
--- a/srcpkgs/qt5dxcb-plugin/template
+++ b/srcpkgs/qt5dxcb-plugin/template
@@ -29,6 +29,11 @@ pre_configure() {
 		msg_red "${_qt5_version%_*} does not match ${_qt5_dep_ver}\\n"
 		exit 1
 	fi
+
+	# no headers for 5.13.1 yet; 5.13.0 headers are the same for this
+	# remove on next version upgrade (after upstream has added them)
+	ln -s ${wrksrc}/platformplugin/libqt5xcbqpa-dev/5.13.0 \
+	      ${wrksrc}/platformplugin/libqt5xcbqpa-dev/5.13.1
 }
 
 if [ "$CROSS_BUILD" ]; then
```

The reason for that is that the headers weren't added for 5.13.1 yet. I diffed the 5.13.0 headers against the ones from 5.13.1 Qt source, and the only change was that 5.13.1 added some non-virtual private method in a place which is irrelevant for this, so for now this is perfectly okay.

Should be removed for next bump afterwards, though.