libparse: install headers for use in plugins

Makefile

@@ -627,6 +627,7 @@ endif
 $(eval $(call add_include_file,libs/sha1/sha1.h))
 $(eval $(call add_include_file,libs/json11/json11.hpp))
 $(eval $(call add_include_file,passes/fsm/fsmdata.h))
+$(eval $(call add_include_file,passes/techmap/libparse.h))
 $(eval $(call add_include_file,frontends/ast/ast.h))
 $(eval $(call add_include_file,frontends/ast/ast_binding.h))
 $(eval $(call add_include_file,frontends/blif/blifparse.h))

passes/techmap/libparse.h

@@ -26,6 +26,11 @@
 #include <vector>
 #include <set>
 
+/**
+ * This file is likely to change in the near future.
+ * Rely on it in your plugins at your own peril
+ */
+
 namespace Yosys
 {
 	struct LibertyAst