lib: Disable emerge color

Although Jenkins is supposed to be able to decode ANSI escape sequences
for terminal colors, it doesn't do so in all cases and when it does, it
doesn't seem to produce the right result for output from `emerge`.

lib/bootstrap.sh

@@ -15,7 +15,7 @@ emerge -kvnuUDj --rebuilt-binaries=y --root=/mnt/gentoo sys-apps/baselayout
 # At some point, we may end up with an Aimee OS profile for Portage.
 # If/when that happens, we can override @system to remove the stuff we
 # don't want, like virtual/service-manager and virtual/openssh.
-xargs emerge -kvnuUDj --rebuilt-binaries=y --root=/mnt/gentoo --color=y <<EOF
+xargs emerge -kvnuUDj --rebuilt-binaries=y --root=/mnt/gentoo <<EOF
 app-arch/gzip
 dev-build/make
 net-misc/wget

lib/crossdev.sh

@@ -17,7 +17,7 @@ masters = gentoo
 auto-sync = no
 EOF
 
-emerge -kvnuUDj --rebuilt-binaries=y --color=y sys-devel/crossdev
+emerge -kvnuUDj --rebuilt-binaries=y sys-devel/crossdev
 
 crossdev --stable -t "$1"
 

lib/tools.sh

@@ -1,10 +1,10 @@
 #!/bin/sh
 
-xargs -r emerge -vnuUj --rebuilt-binaries=y --color=y <<EOF
+xargs -r emerge -vnuUj --rebuilt-binaries=y <<EOF
 sys-apps/shadow
 EOF
 
-xargs -r emerge -vnuUj --rebuilt-binaries=y --color=y <<EOF
+xargs -r emerge -vnuUj --rebuilt-binaries=y <<EOF
 app-emulation/qemu
 sec-policy/selinux-base
 sys-apps/policycoreutils