CI: that didn't help, just remove it.

The error is bogus (Illumos, and probably Solaris, don't free up
everything allocated by the gettext code before exiting; it's still
reachable), and nothing obvious seems to make valgrind Just Shut Up
about it.

Author: guyharris

build_matrix.sh

@@ -29,7 +29,7 @@ fi
 COUNT=0
 export LIBPCAP_TAINTED
 if command -v valgrind >/dev/null 2>&1; then
-    VALGRIND_CMD="valgrind --leak-check=full --show-reachable=no --error-exitcode=1"
+    VALGRIND_CMD="valgrind --leak-check=full --error-exitcode=1"
     export VALGRIND_CMD
 fi