[Buildroot] [git commit branch/2021.05.x] utils/getdeveloperlib.py: explicitly set devs document encoding

[Peter Korsgaard <peter@korsgaard.com>]

commit: https://git.buildroot.net/buildroot/commit/?id=e78fce6e34227ecc11c5501d42b56f37b4762d52
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.05.x

Explicitly indicate the file encoding to UTF-8 for the DEVELOPERS
document. This prevents Unicode decoding errors when printing E-Mail
entries with Unicode characters on systems using an alternative default
encoding (e.g. 'CP1252').

This corrects the following observed error:

    $ ./utils/get-developers outgoing/*
    Traceback (most recent call last):
      File "utils\get-developers", line 105, in <module>
        __main__()
      File "utils\get-developers", line 47, in __main__
        devs = getdeveloperlib.parse_developers()
      File "...\buildroot\utils\getdeveloperlib.py", line 239, in parse_developers
        for line in f:
      File "...\Python<ver>\lib\encodings\cp1252.py", line 23, in decode
        return codecs.charmap_decode(input,self.errors,decoding_table)[0]
    UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 6659: character maps to <undefined>

Signed-off-by: James Knight <james.d.knight@live.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 9f127cc420884adbd42f174ffa9973af01aa827b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 utils/getdeveloperlib.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/utils/getdeveloperlib.py b/utils/getdeveloperlib.py
index b205817033..08abcfed54 100644
--- a/utils/getdeveloperlib.py
+++ b/utils/getdeveloperlib.py
@@ -1,4 +1,5 @@
 from __future__ import print_function
+from io import open
 import os
 import re
 import glob
@@ -231,7 +232,8 @@ def parse_developers():
     linen = 0
     global unittests
     unittests = list_unittests()
-    with open(os.path.join(brpath, "DEVELOPERS"), "r") as f:
+    developers_fname = os.path.join(brpath, 'DEVELOPERS')
+    with open(developers_fname, mode='r', encoding='utf_8') as f:
         files = []
         name = None
         for line in f:
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