Some of the features can't be detected when cross-compiling Bash.
Two of the most missed (at least for me) are named pipes and job
control. This patch enables these two through configure vars.
Arguments to the ./configure can be passed through CONFIGURE_ARGS, no
need to override Build/Configure.
use CONFIGURE_ARGS, pass autodetect overrides in _ARGS, not _VARS
Also, overrides for the features that can't be detected during
cross-compilation have to be passed through ARGS because passing them
through environment (VARS) does not propagate to ./config.status.
Signed-off-by: Jan Čermák <email@example.com>