gnucash trunk: Better check for C++11 compile error in custom_time_zone.hpp

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/8a77e139 (commit)
	from  https://github.com/Gnucash/gnucash/commit/d0fc57a5 (commit)



commit 8a77e139cef35ecbc44ae88531b82a60631e2f8d
Author: John Ralls <john at localhost.localdomain>
Date:   Mon May 11 16:55:15 2015 -0700

    Better check for C++11 compile error in custom_time_zone.hpp
    
    It turns out that F20's boost-1.53 already has this fixed, so set the
    boost version to 1.53 and test for the actual problem.



Summary of changes:
 configure.ac | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 50 insertions(+), 4 deletions(-)