Rollback the quickbook workaround for windows newlines in case it is the cause

of the recent problems with the release documentation build.

Rolled back revisions 49230-49231 via svnmerge from 
https://svn.boost.org/svn/boost/trunk


[SVN r49377]

tools/quickbook

@@ -1 +1 @@
-Subproject commit a9f6e3fec8d4bcefc69156be169ab1a486fe977a
+Subproject commit daf37f8a3e8f36d003e889c7d775a74ab842e687