tools: remove hardcoded references to paths

tools/cc.py

@@ -6,6 +6,7 @@ from dataclasses import dataclass
 import importlib
 import inspect
 import io
+import os
 import re
 import struct
 import subprocess
@@ -15,7 +16,8 @@ import lark
 
 asmod = importlib.import_module("as")
 
-GRAMMAR_FILE = '/home/paulmathieu/vhdl/tools/cc.ebnf'
+_HERE = os.path.dirname(__file__)
+GRAMMAR_FILE = os.path.join(_HERE, 'cc.ebnf')
 CPP = ('cpp', '-P')