gnucash master: Ubuntu 18.04 requires explicit link to pthreads.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/76979554 (commit)
	from  https://github.com/Gnucash/gnucash/commit/1a9fcfef (commit)



commit 76979554a0204f0051a3a37823c3c91425f1548d
Author: John Ralls <jralls at ceridwen.us>
Date:   Sat Sep 14 11:49:12 2019 -0700

    Ubuntu 18.04 requires explicit link to pthreads.



Summary of changes:
 CMakeLists.txt                  | 1 +
 common/test-core/CMakeLists.txt | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)