Moved coder headers to the header files.
diff --git a/coders/coders-private.h b/coders/coders-private.h
index d71a2ed..e13c2cd 100644
--- a/coders/coders-private.h
+++ b/coders/coders-private.h
@@ -16,6 +16,9 @@
 #ifndef MAGICK_CODERS_PRIVATE_H
 #define MAGICK_CODERS_PRIVATE_H
 
+#define MagickCoderHeader(coder,offset,magic)  { coder, offset, \
+  (const unsigned char *) (magic), sizeof(magic)-1 },
+
 #define MagickCoderExports(coder) \
 extern ModuleExport size_t \
   Register ## coder ## Image(void); \