Add missing architectures for packages

The list in packagefs wasn't in sync anyway.

headers/os/package/PackageArchitecture.h

@@ -15,6 +15,9 @@ enum BPackageArchitecture {
 	B_PACKAGE_ARCHITECTURE_X86_GCC2	= 2,
 	B_PACKAGE_ARCHITECTURE_SOURCE	= 3,
 	B_PACKAGE_ARCHITECTURE_X86_64	= 4,
+	B_PACKAGE_ARCHITECTURE_PPC	= 5,
+	B_PACKAGE_ARCHITECTURE_ARM	= 6,
+	B_PACKAGE_ARCHITECTURE_M68K	= 7,
 	//
 	B_PACKAGE_ARCHITECTURE_ENUM_COUNT,
 };