gnucash maint: Tweak version.cmake to work on Windows.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/6ad8ff3b (commit)
	from  https://github.com/Gnucash/gnucash/commit/b64fe864 (commit)



commit 6ad8ff3b4e721d6c9132256ce8511da58796712c
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Jul 8 16:34:35 2016 +0000

    Tweak version.cmake to work on Windows.
    
    Cmake's execute_process doesn't use a shell unless you tell it to.



Summary of changes:
 CMakeLists.txt                | 1 -
 src/core-utils/CMakeLists.txt | 4 +---
 2 files changed, 1 insertion(+), 4 deletions(-)