rt-tests: Makefile: Use sysconfig instead of distutils for PYLIB

Use sysconfig instead of distutils for PYLIB
Version 2 takes into consideration that different versions of python
produce different results.

Signed-off-by: John Kacur <jkacur@redhat.com>

Makefile

@@ -34,7 +34,7 @@ CFLAGS ?= -Wall -Wno-nonnull -Wextra
 CPPFLAGS += -D_GNU_SOURCE -Isrc/include
 LDFLAGS ?=
 
-PYLIB  ?= $(shell python3 -c 'import distutils.sysconfig;  print (distutils.sysconfig.get_python_lib())')
+PYLIB ?= $(shell python3 -m get_pylib)
 
 # Check for errors, such as python3 not available
 ifeq (${PYLIB},)

get_pylib.py

@@ -0,0 +1,16 @@
+#!/usr/bin/python3
+
+# This file is used during the make process
+
+import sysconfig
+
+# Older versions of python don't have this scheme
+# but produce the answer we expect with 'posix_prefix'
+# Newer versions of python insert 'local' in the path unless we use rpm_prefix
+SCHEME = 'rpm_prefix'
+
+if not SCHEME in sysconfig.get_scheme_names():
+    SCHEME = 'posix_prefix'
+
+PYLIB = sysconfig.get_path('purelib', SCHEME)
+print(PYLIB)