[glibc] Use Linux 5.8 in build-many-glibcs.py.

[Joseph Myers]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=42a00a0fb4c69d940ac5f6b08a57e045e14f22f7

commit 42a00a0fb4c69d940ac5f6b08a57e045e14f22f7
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Fri Aug 7 14:38:12 2020 +0000

    Use Linux 5.8 in build-many-glibcs.py.
    
    This patch makes build-many-glibcs.py use Linux 5.8.
    
    Tested with build-many-glibcs.py (host-libraries, compilers and glibcs
    builds).

Diff:
---
 scripts/build-many-glibcs.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
index efd9a9e6dc..325591b2c6 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -751,7 +751,7 @@ class Context(object):
                             'gcc': 'vcs-10',
                             'glibc': 'vcs-mainline',
                             'gmp': '6.2.0',
-                            'linux': '5.7',
+                            'linux': '5.8',
                             'mpc': '1.1.0',
                             'mpfr': '4.1.0',
                             'mig': 'vcs-mainline',