Use Linux 5.4 in build-many-glibcs.py [committed]

[Joseph Myers]

This patch makes build-many-glibcs.py use Linux 5.4.

Tested with build-many-glibcs.py (compilers and glibcs builds).  
Committed.

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index 4b3c4bfb76..252ac08e6b 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -707,7 +707,7 @@ class Context(object):
                             'gcc': 'vcs-9',
                             'glibc': 'vcs-mainline',
                             'gmp': '6.1.2',
-                            'linux': '5.3',
+                            'linux': '5.4',
                             'mpc': '1.1.0',
                             'mpfr': '4.0.2',
                             'mig': 'vcs-mainline',

-- 
Joseph S. Myers
joseph@codesourcery.com