Icarus Verilog compile patch

--- pform_disciplines.cc	2009-12-30 13:45:06.000000000 -0300
+++ pform_disciplines.cc	2010-06-19 14:58:56.000000000 -0300
@@ -27,8 +27,8 @@
 map<perm_string,ivl_discipline_t> disciplines;
 map<perm_string,ivl_nature_t> access_function_nature;

-static perm_string nature_name = perm_string::perm_string();
-static perm_string nature_access = perm_string::perm_string();
+static perm_string nature_name;
+static perm_string nature_access;

 void pform_start_nature(const char*name)
 {
@@ -82,8 +82,8 @@
 	// expressions that use the access function can find it.
       access_function_nature[nature_access] = tmp;

-      nature_name = perm_string::perm_string();
-      nature_access = perm_string::perm_string();
+      nature_name = perm_string();
+      nature_access = perm_string();
 }


@@ -171,7 +171,7 @@
       FILE_NAME(tmp, loc);

 	/* Clear the static variables for the next item. */
-      discipline_name = perm_string::perm_string();
+      discipline_name = perm_string();
       discipline_domain = IVL_DIS_NONE;
       discipline_potential = 0;
       discipline_flow = 0;