Land https://codereview.chromium.org/889083003/ to update libsrtp to upstream 1.5.0

srtp/doc/Makefile

-# Makefile for libSRTP documentation
-#
-# David A. McGrew
-# Cisco Systems, Inc.
-#
-# This makefile does not use the autoconf system; we don't really need
-# it.  We just run doxygen then latex.  If you don't have either of
-# these, then there is no way that you can make your own
-# documentation.  Of course, you can just go online at pick up the
-# documentation from http://srtp.sourceforge.net.
-
-srcdir = .
-top_srcdir = ..
-top_builddir = ../
-
-
-# Determine the version of the library
-
-version = $(shell cat $(top_srcdir)/VERSION)
-
-
-.PHONY: libsrtpdoc cryptodoc clean
-libsrtpdoc: 
-        @if test ! -e Doxyfile; then \
-                echo "*** Sorry, can't build doc outside source dir"; exit 1; \
-        fi
-        sed 's/LIBSRTPVERSION/$(version)/' header.template > header.tex
-        doxygen
-        sed 's/\subsection/\section/' latex/index.tex > latex/index.tmp
-        mv latex/index.tmp latex/index.tex
-        cd latex; make
-        cp latex/refman.pdf libsrtp.pdf
-
-
-cryptodoc: clean
-        doxygen crypto.dox
-        cd latex; make
-        cp latex/refman.pdf crypto.pdf
-
-clean:
-        rm -rf latex/ header.tex
-        for a in * ; do                                 \
-              if [ -f "$$a~" ] ; then rm -f $$a~; fi;   \
-        done;