Make tst-ungetc use libsupport
Signed-off-by:Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by:
Carlos O'Donell <carlos@redhat.com> (cherry picked from commit 3f7df7e7)
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Signed-off-by:Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by:
Carlos O'Donell <carlos@redhat.com> (cherry picked from commit 3f7df7e7)