services_discovery: Don't build windrive on winrt

modules/services_discovery/Makefile.am

@@ -61,8 +61,10 @@ endif
 
 libwindrive_plugin_la_SOURCES = services_discovery/windrive.c
 if HAVE_WIN32
+if !HAVE_WINSTORE
 sd_LTLIBRARIES += libwindrive_plugin.la
 endif
+endif
 
 libos2drive_plugin_la_SOURCES = services_discovery/os2drive.c
 if HAVE_OS2