qemu-build: Disable -Werror

Werror is useful for the qemu developers, but not for us. When building
for CI we want a binary to be produced if at all possible.

Change-Id: Ife36a3d97100ed64c280acee766887c8c5d68dd8
Signed-off-by: Joel Stanley <joel@jms.id.au>
1 file changed