There was a typo in the .PHONY for the test-build target. If we fix the
typo, the test-build target does not work, because it won't match the
'%' target anymore.
So just remove the .PHONY.
Fixes: 64592d97c1ae ("mk: do not build tests by default")
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>