Add ability to generate ASCII documentation from the TeX files.

These changes add the ability to run 'make asterisk.txt' just like the existing
'make asterisk.pdf' commands to generate a text document from the TeX files we
have in the doc/tex/ directory. I've also updated a few of the .tex files because
they weren't properly escaping certain characters so they would show up as Unicode
characters (like [U+021C]). Made changes to the configure scripts so it would
detect the catdvi program which is required to convert the .dvi file generated
by latex.

I've also added a few lines to the build_tools/prep_tarball script so that the
text documentation gets generated and added to future tarballs of Asterisk
releases.

(closes issue #17220)
Reported by: lmadsen
Patches: 
      asterisk.txt.patch uploaded by lmadsen (license 10)
      asterisk.txt.patch-v4 uploaded by pabelanger (license 224)
Tested by: lmadsen, pabelanger

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@258351 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 4 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 323b20f06..086234d76 100644
--- a/Makefile
+++ b/Makefile
@@ -987,6 +987,10 @@ pdf: asterisk.pdf
 asterisk.pdf:
 	$(MAKE) -C doc/tex asterisk.pdf
 
+txt: asterisk.txt
+asterisk.txt:
+	$(MAKE) -C doc/tex asterisk.txt
+
 .PHONY: menuselect
 .PHONY: main
 .PHONY: sounds