gnucash maint: replace guile strftime with gnc-print-time64

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/5873980c (commit)
	from  https://github.com/Gnucash/gnucash/commit/957df9a3 (commit)



commit 5873980c0cba4a3d0193a81d6028c58f47ae2ac2
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Mon May 27 22:43:05 2019 +0800

    replace guile strftime with gnc-print-time64
    
    addendum to ed42f8ac
    
    guile's strftime is/was buggy; cannot handle non-UTF8 locales. Use
    gnc_print_time64 instead. see the following
    
    http://lists.gnu.org/archive/html/bug-guile/2019-05/msg00003.html



Summary of changes:
 gnucash/import-export/qif-imp/qif-parse.scm        |  2 +-
 .../report/business-reports/customer-summary.scm   |  6 ++--
 gnucash/report/business-reports/invoice.scm        |  3 +-
 gnucash/report/business-reports/job-report.scm     |  6 ++--
 gnucash/report/business-reports/owner-report.scm   |  6 ++--
 gnucash/report/business-reports/receipt.eguile.scm |  2 +-
 .../report/business-reports/taxinvoice.eguile.scm  |  6 ++--
 gnucash/report/locale-specific/us/taxtxf-de_DE.scm | 18 +++++-----
 gnucash/report/locale-specific/us/taxtxf.scm       | 42 ++++++++++------------
 .../report/stylesheets/stylesheet-head-or-tail.scm |  4 +--
 gnucash/report/utility-reports/hello-world.scm     | 11 +++---
 11 files changed, 45 insertions(+), 61 deletions(-)