improve compatibility with really old python

ShellB3/sbin/re-l

@@ -61,7 +61,7 @@ def extractRelInterpreter(filepath):
         raise RuntimeError("Not a re-l script!")
     for line in range(2,5):
         l=getLine(filepath,linenumber=line)
-        if l.startswith(('#re-l:','#:')):
+        if l.startswith('#re-l:') or l.startswith('#:'):
             return l.split(':',1)[1].strip()
     raise RuntimeError("Couldn't find re-lative interpreter line (starts with '#re-l:')")