Fix five latent bugs surfaced while porting to WASM

These bugs all exist in stock Magic but were tolerated by the K&R-loose
native build. The strict WASM call_indirect type checks turned them up.

* cif/CIFhier.c: ASSERT in cifFlatMaskHints accessed
  oldproprec->prop_value.prop_type, but prop_type is a top-level member
  of PropertyRecord. Changed to oldproprec->prop_type.

* extflat/EFargs.c: efLoadSearchPath was assigning a pointer to a
  string literal ("." in RO data), which callers later try to free or
  StrDup. Replaced with StrDup(path, ".") so the pointer always lives
  on the heap.

* router/rtrVia.c: rtrFollowName called RtrMilestonePrint("#"), but
  the function takes no arguments.

* sim/SimSelect.c: SimAddLabels called DBWLabelChanged with five
  arguments, but its real signature is (CellDef *, Label *, int).
  Replaced with the equivalent DBWAreaChanged call.

* windows/windView.c: extern declaration of DBMovePoint had return
  type void, but the function actually returns bool.

cif/CIFhier.c

@@ -284,7 +284,7 @@ cifFlatMaskHints(
 	oldproprec = (PropertyRecord *)DBPropGet(mhd->mh_def, name, &propfound);
 	if (propfound)
 	{
-	    ASSERT(oldproprec->prop_value.prop_type == PROPERTY_TYPE_PLANE, 
+	    ASSERT(oldproprec->prop_type == PROPERTY_TYPE_PLANE,
 			"cifFlatMaskHints");
 	    plane = oldproprec->prop_value.prop_plane;
 	}

extflat/EFargs.c

@@ -367,7 +367,7 @@ efLoadSearchPath(path)
     PaVisitFiles(DOT_MAGIC_PATH, ".magicrc", pv);
     PaVisitFree(pv);
     if (*path == NULL)
-	*path = ".";
+	StrDup(path, ".");
 }
 
 int

router/rtrVia.c

@@ -159,7 +159,7 @@ rtrFollowName(name, firstInNet, area)
 {
     if ( firstInNet )
     {
-	RtrMilestonePrint("#");
+	RtrMilestonePrint();
 	(void) DBSrLabelLoc(EditCellUse, name, rtrFollowLocFunc, (ClientData) area);
     }
     return 0;

sim/SimSelect.c

@@ -640,8 +640,7 @@ SimAddLabels(
 	pos = SimPutLabel(rootuse, &selectBox, GEO_CENTER,
 		current->tl_simLabel, TT_SPACE);
 	DBReComputeBbox(rootuse);
-	DBWLabelChanged(rootuse, current->tl_simLabel, &selectBox,
+	DBWAreaChanged(rootuse, &selectBox, DBW_ALLWINDOWS, &DBAllButSpaceBits);
-	    pos, DBW_ALLWINDOWS);
     }
 }
 

windows/windView.c

@@ -316,7 +316,7 @@ void
 WindTranslate(origx, origy)
     int origx, origy;
 {
-    extern void DBMovePoint();
+    extern bool DBMovePoint();
     MagWindow *w2;
     Rect newArea;