Remove the usr/ directory in addition to its contents

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
libdvbpsi: Better fix for lack of asprintf()

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
openblas: update

Closes #408.

Signed-off-by: Timothy Gu <timothygu99@gmail.com>