libgo: don't use wc in gotest

The wc command is not in the GNU approved list of Makefile utilities
(https://www.gnu.org/prep/standards/html_node/Utilities-in-Makefiles.html#Utilities-in-Makefiles).

Change-Id: I5491352662e6218a165b91c9b723720d1aa46b02
Reviewed-on: https://go-review.googlesource.com/c/144897
Reviewed-by: Than McIntosh <thanm@google.com>
1 file changed