Bug 1579506 - Remove OpenAES source code and references r=bryce,mhoye

With NSS now being used to do the decryption in the Clearkey CDM, remove the
source and licensing information related to OpenAES.

Differential Revision: https://phabricator.services.mozilla.com/D45205

--HG--
extra : moz-landing-system : lando

Author: Ryan Alderete

.clang-format-ignore

@@ -114,7 +114,6 @@ js/src/vtune/jitprofiling.c
 js/src/vtune/jitprofiling.h
 js/src/vtune/legacy/.*
 media/ffvpx/.*
-media/gmp-clearkey/0.1/openaes/.*
 media/kiss_fft/.*
 media/libaom/.*
 media/libcubeb/.*

media/gmp-clearkey/0.1/moz.build

@@ -25,10 +25,6 @@ UNIFIED_SOURCES += [
     'gmp-clearkey.cpp',
 ]
 
-SOURCES += [
-    'openaes/oaes_lib.c',
-]
-
 if CONFIG['OS_ARCH'] == 'WINNT':
     UNIFIED_SOURCES += [
         'VideoDecoder.cpp',