gnucash maint: Fix missing prototype error, void end of function error on Windows.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/f3c2d1e1 (commit)
	from  https://github.com/Gnucash/gnucash/commit/db4417b2 (commit)



commit f3c2d1e1455a2447b57d6bbe86fcada338eca4ff
Author: John Ralls <jralls at ceridwen.us>
Date:   Thu Mar 25 13:31:19 2021 -0700

    Fix missing prototype error, void end of function error on Windows.
    
    MinGW64 gcc silently ignores C prototype with no arguments, issuing
    a missing prototype error instead. set_platform_locale must return
    a free-able char* even if all of LC_ALL, LC_MESSAGES, and LANG are
    unset.



Summary of changes:
 gnucash/gnucash-locale-platform.h | 2 +-
 gnucash/gnucash-locale-windows.c  | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)