tests: parallelise 'make valgrind'

Use $(MAKE) instead of 'make' inside the Makefile,
otherwise the make will run as if -j1 had been
specified and complain about the job server not
being available, and with $(MAKE) in inherits the
parent make's settings it seems.

Upgrade common submodule for parallel check-valgrind.

Let this settle a bit before upgrading the other modules.

1 files changed, 0 insertions, 0 deletions

diff --git a/common b/common
-Subproject 36388a18d37d72f9633bf1a8c06d18d310d215b
+Subproject 6e754981c5e37a79e35dce01ce0130d5f1eff21