Makefile: Removed default PDF creation of Toaster Manual.

(From yocto-docs rev: 7cceb7b0a0f53a4207070ff369bec8a3a6ceb135)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/Makefile

@@ -327,7 +327,7 @@ endif
 
 ifeq ($(DOC),toaster-manual)
 XSLTOPTS = --xinclude
-ALLPREQ = html pdf tarball
+ALLPREQ = html tarball
 TARFILES = toaster-manual.html toaster-manual.pdf toaster-manual-style.css figures/toaster-title.png
 MANUALS = $(DOC)/$(DOC).html $(DOC)/$(DOC).pdf
 FIGURES = figures