gnucash master: Add missing macros

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash/commit/c4c45e95 (commit)
	from  https://github.com/Gnucash/gnucash/commit/790e358d (commit)



commit c4c45e950529d4ded6890d600159b76ebd1336f9
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Fri Mar 17 09:42:05 2017 +0100

    Add missing macros



Summary of changes:
 ..._ax_check_compile_flag.m4 => ax_append_flag.m4} | 61 ++++++++++------------
 ...ck_compile_flag.m4 => ax_check_compile_flag.m4} | 10 ++--
 2 files changed, 34 insertions(+), 37 deletions(-)
 copy macros/{m4_ax_check_compile_flag.m4 => ax_append_flag.m4} (51%)
 copy macros/{m4_ax_check_compile_flag.m4 => ax_check_compile_flag.m4} (93%)