contrib: Remove obsolete libhsmd_python class

This has been replaced with better rust bindings that can then be
consumed via pyo3, consolidating the C interface in a portable
wrapper.

Changelog-Removed: libhsmd: Removed the `libhsmd_python` wrapper as it was unused

Author: cdecker

Makefile

@@ -370,7 +370,7 @@ include devtools/Makefile
 include tools/Makefile
 include plugins/Makefile
 include tests/plugins/Makefile
-include contrib/libhsmd_python/Makefile
+
 ifneq ($(FUZZING),0)
 	include tests/fuzz/Makefile
 endif