Fix inclusion of generated headers when used as Meson subproject

Author: aperezdc

include/wpe/wpe.h

@@ -40,10 +40,17 @@
 #include "loader.h"
 #include "pasteboard.h"
 #include "renderer-host.h"
-#include "version.h"
-#include "version-deprecated.h"
 #include "view-backend.h"
 
+/*
+ * The wpe/ prefix is needed for autogenerated headers to avoid
+ * breaking building libwpe as a Meson subproject, because headers
+ * in that case are uninstalled and will be picked from the directory
+ * where they are generated (instead of where they are installed.)
+ */
+#include "wpe/version.h"
+#include "wpe/version-deprecated.h"
+
 #undef __WPE_H_INSIDE__
 
 #endif /* __wpe_h__ */