Don't automatically overwrite manual .pdf file

Automatically updating the manual pdf file causes a local
git change. This messes up "repo sync" calls because of the
local change. Instead, just write an un-tracked file that can
be used to update the tracked version of the manual .pdf.

Change-Id: Icd7edc244df60728ec169c5aa1cf8b322ca4143b
(cherry picked from commit 8e6f7c7)

CMakeLists.txt

@@ -216,7 +216,7 @@ if (DOXYGEN_FOUND AND LATEX_FOUND)
   add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/latex/refman.pdf
          COMMAND make  > /dev/null
          COMMAND cp  ${CMAKE_CURRENT_BINARY_DIR}/latex/refman.pdf
-                      ${CMAKE_CURRENT_SOURCE_DIR}/docs/${RSMI_MANUAL_NAME}.pdf
+                  ${CMAKE_CURRENT_SOURCE_DIR}/docs/${RSMI_MANUAL_NAME}_new.pdf
          DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/latex/refman.tex
          WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/latex)