gnucash-on-windows master: Multiple changes pushed

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash-on-windows/commit/6ba18441 (commit)
	 via  https://github.com/Gnucash/gnucash-on-windows/commit/cfd8b4bf (commit)
	 via  https://github.com/Gnucash/gnucash-on-windows/commit/c68c7bee (commit)
	from  https://github.com/Gnucash/gnucash-on-windows/commit/dbb48610 (commit)



commit 6ba18441ac2923378698f82779c7f7ed7a2e18f1
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Mar 6 15:20:01 2018 -0800

    Uninstall GnuCash before building.
    
    To prevent linking from an old build screwing up the current one.
    Also remove the jhbuild info and  manifest on a releases build to
    force rebuilding if the release is the same.

commit cfd8b4bfb0359f41f88d41ee180cef0fc7d0f167
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Mar 6 13:43:08 2018 -0800

    Fix msgfmt can't find its rules for appdata.xml.in.
    
    Also fix a jhbuild snivel about unknown variable mingw_base.

commit c68c7bee8953d8316c043187a6289742fbde4586
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Mar 6 11:29:31 2018 -0800

    Use correct shell and specific target directory in the final message.



Summary of changes:
 buildserver/build_package.ps1 | 18 ++++++++++++++++++
 jhbuildrc.in                  |  8 ++++----
 setup-mingw64.ps1             |  2 +-
 3 files changed, 23 insertions(+), 5 deletions(-)