Rename Header to HulkHeader

src/hulk/header.d

@@ -6,7 +6,7 @@ module hulk.header;
 /**
  * Header describing the HULK image.
  */
-struct Header
+struct HulkHeader
 {
     /**
      * Total size of memory to be mapped.

src/hulk/hulk.d

@@ -16,7 +16,7 @@ import hulk.hurl;
 extern extern(C) __gshared ubyte _hulk_total_size;
 
 @(ldc.attributes.section(".hulk_header"))
-private __gshared Header hulk_header = {
+private __gshared HulkHeader hulk_header = {
     &_hulk_total_size, /* total_size */
     &hulk_start, /* entry */
     16u * 1024u, /* stack_size */