gnucash maint: Allow HTMLHELP_DIR to be specified on cmake command line

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/2c268ba0 (commit)
	from  https://github.com/Gnucash/gnucash/commit/cc1b68a3 (commit)



commit 2c268ba09cf1874de9ef2d430d9243e63f83b4f7
Author: Rob Gowin <robgowin at gmail.com>
Date:   Thu Jul 14 20:44:09 2016 -0500

    Allow HTMLHELP_DIR to be specified on cmake command line



Summary of changes:
 CMakeLists.txt | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)