widevine: enable Linux aarch64 download from repo (#647)

Google finally released a widevine version for 64bit ARM Linux,
current version in the repo is 4.10.3057.0.

This saves a lot of time compared to downloading+extracting the
ChromeOS image.

As it's a native Linux version we also no longer need those nasty
glibc hacks / widevine library patches.

Tested on RPi5 running LibreELEC master with the glibc RELR patches
dropped.

Signed-off-by: Matthias Reichl <hias@horus.com>

Author: HiassofT

lib/inputstreamhelper/widevine/repo.py

@@ -11,7 +11,7 @@
 def cdm_from_repo():
     """Whether the Widevine CDM is available from Google's library CDM repository"""
     # Based on https://source.chromium.org/chromium/chromium/src/+/master:third_party/widevine/cdm/widevine.gni
-    if 'x86' in arch() or arch() == 'arm64' and system_os() in ('Darwin', 'Windows'):
+    if 'x86' in arch() or arch() == 'arm64' and system_os() in ('Darwin', 'Linux', 'Windows'):
         return True
     return False
 
@@ -45,7 +45,7 @@ def latest_widevine_available_from_repo(cdm_os, cdm_arch):
                 'platform': cdm_os,
             },
             'protocol': '4.0',
-            'updaterversion': '142.0.7444.175'
+            'updaterversion': '151.0.7922.173'
         }
     }
     text = http_post(url, data=json.dumps(payload).encode('utf-8'), headers=headers)