[glibc] Fix invalid escape sequence in build-many-glibcs.py

[glibc] Fix invalid escape sequence in build-many-glibcs.py

[Joseph Myers]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=781427354068535f159388776da4f21043e237a8

commit 781427354068535f159388776da4f21043e237a8
Author: Joseph Myers <josmyers@redhat.com>
Date:   Wed Jan 10 13:01:39 2024 +0000

    Fix invalid escape sequence in build-many-glibcs.py
    
    Running build-many-glibcs.py with Python 3.12 or later produces a
    warning:
    
    build-many-glibcs.py:173: SyntaxWarning: invalid escape sequence '\.'
      m = re.fullmatch('([0-9]+)\.([0-9]+)[.0-9]*', l)
    
    Use a raw string instead to avoid that warning.  (Note: I haven't
    checked whether any other Python scripts included with glibc might
    have issues with newer Python versions.)

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 7e0b90be89..9a929a6430 100755
--- a/scripts/build-many-glibcs.py
+++ b/scripts/build-many-glibcs.py
@@ -170,7 +170,7 @@ class Context(object):
             if l.startswith(starttext):
                 l = l[len(starttext):]
                 l = l.rstrip('"\n')
-                m = re.fullmatch('([0-9]+)\.([0-9]+)[.0-9]*', l)
+                m = re.fullmatch(r'([0-9]+)\.([0-9]+)[.0-9]*', l)
                 return '%s.%s' % m.group(1, 2)
         print('error: could not determine glibc version')
         exit(1)