Cleanup: remove Python version 2 checks

These were included for when Python2 was still often the default.

source/blender/makesrna/rna_cleanup/rna_cleaner.py

@@ -327,8 +327,4 @@ def main():
 
 
 if __name__ == '__main__':
-    import sys
+    main()
-    if sys.version_info.major < 3:
-        print("Incorrect Python version, use Python 3 or newer!")
-    else:
-        main()

tools/check_source/check_cmake_consistency.py

@@ -9,12 +9,6 @@ __all__ = (
     "main",
 )
 
-import sys
-if sys.version_info.major < 3:
-    print("\nPython3.x needed, found %s.\nAborting!\n" %
-          sys.version.partition(" ")[0])
-    sys.exit(1)
-
 import os
 from os.path import (
     dirname,

tools/check_source/project_source_info.py

@@ -11,13 +11,6 @@ __all__ = (
 )
 
 
-import sys
-if sys.version_info.major < 3:
-    print("\nPython3.x or newer needed, found %s.\nAborting!\n" %
-          sys.version.partition(" ")[0])
-    sys.exit(1)
-
-
 import os
 from os.path import join, dirname, normpath, abspath
 

tools/utils_ide/project_info.py

@@ -33,13 +33,6 @@ from collections.abc import (
 )
 
 
-import sys
-if sys.version_info.major < 3:
-    print("\nPython3.x needed, found %s.\nAborting!\n" %
-          sys.version.partition(" ")[0])
-    sys.exit(1)
-
-
 import subprocess
 import os
 from os.path import (