PATCH: adapting gettextize to autoconf 2.50

[Paolo Bonzini]

This small patch makes gettextize recognize
configure.ac as well as configure.in; it is relative
to 0.10.35:

*** gettext-0.10.35/gettextize Thu Aug 24 04:00:36 2000
--- gettext-bonz/gettextize Mon Jun 18 10:20:43 2001
***************
*** 91,98 ****
  gettext_dir=/usr/share/gettext
  aclocal_dir=/usr/share/aclocal

! test -f configure.in || {
!   $echo "Missing configure.in, please cd to your package first."
    exit 1
  }

--- 91,101 ----
  gettext_dir=/usr/share/gettext
  aclocal_dir=/usr/share/aclocal

! configure_ac=configure.in
! test -f configure.ac && configure_ac=configure.ac
!
! test -f $configure_ac || {
!   $echo "Missing $configure_ac, please cd to your package first."
    exit 1
  }

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