PATCH: Make the location of texi2html configurable

[Jesse W <jessw@xxxxxxxxxxx>]

The copy of texi2html that I'm using with zsh isn't installed on my 
path, so I need to specify it.  This patch enables me to do that via 
./configure .

Jesse

Index: configure.ac
===================================================================
RCS file: /cvsroot/zsh/zsh/configure.ac,v
retrieving revision 1.125
diff -c -r1.125 configure.ac
*** configure.ac        26 May 2009 09:59:18 -0000      1.125
--- configure.ac        30 May 2009 00:29:38 -0000
***************
*** 540,545 ****
--- 540,546 ----
  AC_CHECK_PROGS([YODL], [yodl], [: yodl])
  AC_CHECK_PROGS([PDFETEX], [pdfetex], [: pdfetex])
  AC_CHECK_PROGS([TEXI2PDF], [texi2pdf], [])
+ AC_CHECK_PROGS([TEXI2HTML], [texi2html], [])
  AC_CHECK_PROGS([ANSI2KNR], [ansi2knr], [: ansi2knr])

  if test x"$ansi2knr" = xyes && test x"$ANSI2KNR" = x": ansi2knr"; then

Index: Doc/Makefile.in
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Makefile.in,v
retrieving revision 1.46
diff -c -r1.46 Makefile.in
*** Doc/Makefile.in     25 May 2009 16:09:41 -0000      1.46
--- Doc/Makefile.in     30 May 2009 00:29:42 -0000
***************
*** 40,46 ****
  MAKEINFO = makeinfo
  TEXI2DVI = texi2dvi
  DVIPS = dvips
! TEXI2HTML = texi2html --output . --ifinfo --split=chapter --node-files

  .SUFFIXES: .yo .1

--- 40,46 ----
  MAKEINFO = makeinfo
  TEXI2DVI = texi2dvi
  DVIPS = dvips
! TEXI2HTML = @TEXI2HTML@ --output . --ifinfo --split=chapter 
--node-files

  .SUFFIXES: .yo .1