gnucash master: Fix a pair of missed extern "C" decls.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/f8465dad (commit)
	from  https://github.com/Gnucash/gnucash/commit/17820ec2 (commit)



commit f8465dadf42d21ee443ea908a3e531e05b593662
Author: John Ralls <jralls at ceridwen.us>
Date:   Thu Jan 26 12:43:52 2023 -0800

    Fix a pair of missed extern "C" decls.



Summary of changes:
 borrowed/libc/strptime.h                      | 8 +++++++-
 gnucash/gnome/assistant-stock-transaction.cpp | 3 +++
 2 files changed, 10 insertions(+), 1 deletion(-)