[PATCH] Move is_valid_fd to filedescriptor.c file.

[Martin Liška]

Hi.

As Jakub correctly noted, I used a piggy backing to put the new function
to a file that is supposed to contain different functions. So that
I'm suggesting a new file. Moreover, I'm also adding dup2 fallback.

Patch can bootstrap on x86_64-linux-gnu and survives regression tests.

Ready to be installed?
Thanks,
Martin

libiberty/ChangeLog:

2019-08-08  Martin Liska  <mliska@suse.cz>

	* Makefile.in: Add filedescriptor.c.
	* filedescriptor.c: New file.
	* lrealpath.c (is_valid_fd): Remove.
---
 libiberty/Makefile.in      | 14 +++++++++++-
 libiberty/filedescriptor.c | 47 ++++++++++++++++++++++++++++++++++++++
 libiberty/lrealpath.c      | 16 -------------
 3 files changed, 60 insertions(+), 17 deletions(-)
 create mode 100644 libiberty/filedescriptor.c


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