build{,-rootfs}: Do not force TTY

The `-o` argument to `xargs` tells it to reopen a TTY to pass to the
spawned process's standard input.  If there is no controlling TTY, this
will fail.  There's no reason to do this anyway, so let's avoid it.

build-rootfs.sh

@@ -22,7 +22,7 @@ emerge \
 cat \
     install.packages \
     "${CONFIGDIR}"/install.packages \
-    | xargs -ro \
+    | xargs -rt \
 ${target}-emerge \
     --root=/mnt/gentoo \
     --config-root="${O}"/portage \
@@ -30,7 +30,7 @@ ${target}-emerge \
     --rebuilt-binaries=y
 
 if [ -f "${CONFIGDIR}"/installonly.packages ]; then
-    < "${CONFIGDIR}"/installonly.packages xargs -ro \
+    < "${CONFIGDIR}"/installonly.packages xargs -rt \
     ${target}-emerge \
         --root=/mnt/gentoo \
         --config-root="${O}"/portage \

build.sh

@@ -16,6 +16,6 @@ cat \
     install.packages \
     "${CONFIGDIR}"/build.packages \
     "${CONFIGDIR}"/install.packages \
-    | xargs -rot \
+    | xargs -rt \
 ${target}-emerge -bkvnuUDj
 ${target}-emerge -bv @preserved-rebuild