Merged revisions 47527 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r47527 | russell | 2006-11-13 00:48:18 -0500 (Mon, 13 Nov 2006) | 5 lines

AC_PROG_SED is included in autoconf 2.60, but apparently it is not included
in 2.59.  So, to maintain compatability with 2.59 since it is a small change,
copy this macro into acinclude.m4 and rename it to AST_PROG_SED.
(issue #8345)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@47529 65c4cc65-6c06-0410-ace0-fbb531ad65f3