[Rpm-maint] [rpm-software-management/rpm] validFilename: Use iscntrl from ctype.h (#773)

[Christopher Layne]

* Rather than reinventing it, use a standard C function with the added
  bonus that `iscntrl` clearly states what the problem set is.

Reference: https://en.cppreference.com/w/Template:c/string/character_classes
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/773

-- Commit Summary --

  * validFilename: Use iscntrl from ctype.h

-- File Changes --

    M build/files.c (5)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/773.patch
https://github.com/rpm-software-management/rpm/pull/773.diff

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