gnucash-on-windows master: update url, fix 404 error

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash-on-windows/commit/177e4027 (commit)
	from  https://github.com/Gnucash/gnucash-on-windows/commit/645570e2 (commit)



commit 177e40275a7e0129492ab68024304cbbe9326661
Author: cjh0613 <c at cjh0613.com>
Date:   Tue Jul 20 21:59:19 2021 +0800

    update url, fix 404 error



Summary of changes:
 .gitignore        | 1 +
 setup-mingw64.ps1 | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)