Arch() on a MultiArch:all version should return "all" to be compatible

with previous usecases. You now need to requested with Arch(true) the
return of the architecture this version (and pseudo package) was created for.

apt-pkg/cacheiterators.h

@@ -178,7 +178,16 @@ class pkgCache::VerIterator : public Iterator<Version, VerIterator> {
 	// Accessors
 	inline const char *VerStr() const {return S->VerStr == 0?0:Owner->StrP + S->VerStr;};
 	inline const char *Section() const {return S->Section == 0?0:Owner->StrP + S->Section;};
-	inline const char *Arch() const {return S->ParentPkg == 0?0:Owner->StrP + ParentPkg()->Arch;};
+	inline const char *Arch() const {
+		if(S->MultiArch == pkgCache::Version::All)
+			return "all";
+		return S->ParentPkg == 0?0:Owner->StrP + ParentPkg()->Arch;
+	};
+	inline const char *Arch(bool const pseudo) const {
+		if(pseudo == false)
+			return Arch();
+		return S->ParentPkg == 0?0:Owner->StrP + ParentPkg()->Arch;
+	};
 	inline PkgIterator ParentPkg() const {return PkgIterator(*Owner,Owner->PkgP + S->ParentPkg);};
 
 	inline DescIterator DescriptionList() const;