build: Don't cd back to the root directory after having compiled virtc
build: Don't cd back to the root directory after having compiled virtc

Each line in a Makefile rule is executed in a sub-shell so we can remove
the last cd. Fewer things, easier maintenance! (if we move virtc around
for instance).

Signed-off-by: Damien Lespiau <64bd3cb94f359c1a3ce68dae5e26b40578526277@intel.com>

wcwxyz/virtcontainers,containers/virtcontainers,wcwxyz/virtcontainers,containers/virtcontainers,wcwxyz/virtcontainers