Moved aliases to coder header file.
diff --git a/coders/coders-private.h b/coders/coders-private.h
index e13c2cd..1af7608 100644
--- a/coders/coders-private.h
+++ b/coders/coders-private.h
@@ -19,6 +19,8 @@
 #define MagickCoderHeader(coder,offset,magic)  { coder, offset, \
   (const unsigned char *) (magic), sizeof(magic)-1 },
 
+#define MagickCoderAlias(coder,alias)  { coder, alias },
+
 #define MagickCoderExports(coder) \
 extern ModuleExport size_t \
   Register ## coder ## Image(void); \