Fixes related to r312: gcc refuses to erase a const_iterator

src/ifcparse/IfcParse.cpp

@@ -1193,7 +1193,7 @@ void IfcFile::removeEntity(IfcUtil::IfcBaseClass* entity) {
 						IfcEntityListList::ptr new_list(new IfcEntityListList);
 						for (IfcEntityListList::outer_it it = instance_list_list->begin(); it != instance_list_list->end(); ++it) {
 							std::vector<IfcUtil::IfcBaseClass*> instances = *it;
-							std::vector<IfcUtil::IfcBaseClass*>::const_iterator jt;
+							std::vector<IfcUtil::IfcBaseClass*>::iterator jt;
 							while ((jt = std::find(instances.begin(), instances.end(), entity)) != instances.end()) {
 								instances.erase(jt);
 							}

src/ifcparse/IfcUtil.cpp

@@ -42,7 +42,7 @@ bool IfcEntityList::contains(IfcUtil::IfcBaseClass* instance) const {
 	return std::find(ls.begin(), ls.end(), instance) != ls.end();
 }
 void IfcEntityList::remove(IfcUtil::IfcBaseClass* instance) {
-	std::vector<IfcUtil::IfcBaseClass*>::const_iterator it;
+	std::vector<IfcUtil::IfcBaseClass*>::iterator it;
 	while ((it = std::find(ls.begin(), ls.end(), instance)) != ls.end()) {
 		ls.erase(it);
 	}

src/ifcparse/IfcUtil.h

@@ -138,7 +138,7 @@ public:
 		return r;
 	}
 	void remove(T* t) {
-		typename std::vector<T*>::const_iterator it;
+		typename std::vector<T*>::iterator it;
 		while ((it = std::find(ls.begin(), ls.end(), t)) != ls.end()) {
 			ls.erase(it);
 		}