[COMMITTED] scripts/check-obsolete-constructs.py: Process all headers as UTF-8.

  A few of our installed headers contain UTF-8 in comments.
check-obsolete-constructs opened files without explicitly specifying
their encoding, so it would barf on these headers if “make check” was
run in a non-UTF-8 locale.

	* scripts/check-obsolete-constructs.py (HeaderChecker.check):
	Specify encoding="utf-8" when opening headers to check.
---
 ChangeLog                            | 5 +++++
 scripts/check-obsolete-constructs.py | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)
  

On 3/14/19 9:49 AM, Zack Weinberg wrote:
> A few of our installed headers contain UTF-8 in comments.
> check-obsolete-constructs opened files without explicitly specifying
> their encoding, so it would barf on these headers if “make check” was
> run in a non-UTF-8 locale.
> 
> 	* scripts/check-obsolete-constructs.py (HeaderChecker.check):
> 	Specify encoding="utf-8" when opening headers to check.
> ---
>  ChangeLog                            | 5 +++++
>  scripts/check-obsolete-constructs.py | 2 +-
>  2 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/ChangeLog b/ChangeLog
> index f2cdcd7a66..f0281e5d10 100644
> --- a/ChangeLog
> +++ b/ChangeLog
> @@ -1,3 +1,8 @@
> +2019-03-14  Zack Weinberg  <zackw@panix.com>
> +
> +	* scripts/check-obsolete-constructs.py (HeaderChecker.check):
> +	Specify encoding="utf-8" when opening headers to check.
> +
>  2019-03-13  Joseph Myers  <joseph@codesourcery.com>
>  
>  	* scripts/build-many-glibcs.py (Context.checkout): Default Linux
> diff --git a/scripts/check-obsolete-constructs.py b/scripts/check-obsolete-constructs.py
> index ce5c72251f..89d21dea6e 100755
> --- a/scripts/check-obsolete-constructs.py
> +++ b/scripts/check-obsolete-constructs.py
> @@ -437,7 +437,7 @@ class HeaderChecker:
>      def check(self, fname):
>          self.fname = fname
>          try:
> -            with open(fname, "rt") as fp:
> +            with open(fname, "rt", encoding="utf-8") as fp:
>                  contents = fp.read()
>          except OSError as e:
>              sys.stderr.write("{}: {}\n".format(fname, e.strerror))
> 

Thanks for fixing this!