Fixed make check

Author: Ovascos

test/python/CMakeLists.txt

@@ -1,7 +1,8 @@
 if(LIBPOLY_BUILD_PYTHON_API)
+    find_package(Python3 COMPONENTS Interpreter REQUIRED)
     add_custom_target(check
         COMMAND
-            PYTHONPATH=${CMAKE_BINARY_DIR}/python ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/check.py
+            PYTHONPATH=${CMAKE_BINARY_DIR}/python ${Python3_INTERPRETER} ${CMAKE_CURRENT_SOURCE_DIR}/check.py
         DEPENDS
             polypy
         WORKING_DIRECTORY

test/python/check.py

@@ -5,7 +5,7 @@
 
 
 def forkexec(test, env):
-    if sys.version_info >= (3,0):  #IAM: (3, 2) might be more accurate...
+    if sys.version_info >= (3,2):
         with open(test) as testf:
             code = compile(testf.read(), test, 'exec') #IAM: explicit compile makes debugging easier.
             exec(code, env, env)