Fix incorrect build files.

The MP4Parser is not only used by the text parsers, but also by the
DashParser and Pssh parsing.  This means that it should not appear in
the `build/types/text` build file, but in the `build/types/core` file.

Closes #660

Change-Id: I8524663749644084161d06ca295732550ebc8fc5

Author: TheModMaker

build/types/core

@@ -41,6 +41,7 @@
 +../../lib/util/language_utils.js
 +../../lib/util/manifest_parser_utils.js
 +../../lib/util/map_utils.js
++../../lib/util/mp4_parser.js
 +../../lib/util/multi_map.js
 +../../lib/util/pssh.js
 +../../lib/util/public_promise.js

build/types/text

@@ -4,6 +4,3 @@
 +../../lib/media/mp4_vtt_parser.js
 +../../lib/media/ttml_text_parser.js
 +../../lib/media/vtt_text_parser.js
-+../../lib/util/mp4_parser.js
-
-