firefox: fixed by removing '--docdir' from configure options

www/firefox/firefox.conf

@@ -2,7 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../firefox/firefox.conf
-# Copyright (C) 2006 - 2007 The OpenSDE Project
+# Copyright (C) 2006 - 2010 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2004 Clifford Wolf
 #
@@ -61,3 +61,6 @@ hook_add postmake 6 "$root$bindir/firefox -register"
 # work around for version 2.0
 # Merged from T2
 var_append GCC_WRAPPER_INSERT ' ' "-c?:-L`pkgprefix libdir libx11` -lX11 -lXrender"
+
+# configure script doesn't lile --docdir confopt
+var_remove_regex confopt ' ' "--docdir=.*"