[OpenSCAD] Avoid writing temporary parse cache file

Creating the parsetab.py cache file in a system wide fixed location
(e.g. /tmp/parsetab.py) creates problems when a computer is used by
different users. Also the file is never removed, which is not very nice.

Caching provides hardly any benefit here, as it only takes milliseconds,
and may even be negated by the additional required filesystem operations.

Fixes (part of) #6315.

src/Mod/OpenSCAD/importCSG.py

@@ -35,7 +35,6 @@ printverbose = False
 import FreeCAD
 import io
 import os
-import tempfile
 
 import ply.lex as lex
 import ply.yacc as yacc
@@ -178,9 +177,9 @@ def processcsg(filename):
 
     # Build the parser
     if printverbose: print('Load Parser')
-    # No debug out otherwise Linux has protection exception
-    temp = tempfile.gettempdir()
-    parser = yacc.yacc(debug=False,outputdir=temp)
+    # Disable generation of debug ('parser.out') and table cache ('parsetab.py'),
+    # as it requires a writable location
+    parser = yacc.yacc(debug=False, write_tables=False)
     if printverbose: print('Parser Loaded')
     # Give the lexer some input
     #f=open('test.scad', 'r')