Fix install mask and move dev_mode to true when dev packages are installed

src/scripts/common.sh

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Common constants for build scripts
 # This must evaluate properly for both /bin/bash and /bin/sh
 
 # All scripts should die on error unless commands are specifically excepted
 # by prefixing with '!' or surrounded by 'set +e' / 'set -e'.
 # TODO: Re-enable this once shflags is less prone to dying.
@@ skipping 99 matching lines @@
 then
   INSIDE_CHROOT=1
 else
   INSIDE_CHROOT=0
 fi
 
 # Directory locations inside the dev chroot
 CHROOT_TRUNK_DIR="/home/$USER/trunk"
 
 # Install make for portage ebuilds.  Used by build_image and gmergefs.
-DEFAULT_INSTALL_MASK="/usr/include/ /usr/man /usr/share/man /usr/share/doc \
+DEFAULT_INSTALL_MASK="/usr/include /usr/man /usr/share/man /usr/share/doc \
   /usr/share/gtk-doc /usr/share/gtk-2.0 /usr/lib/gtk-2.0/include \
   /usr/share/info /usr/share/aclocal /usr/lib/gcc /usr/lib/pkgconfig \
   /usr/share/pkgconfig /usr/share/gettext /usr/share/readline /etc/runlevels \
   /usr/share/openrc /lib/rc *.a *.la"
 
 # Check to ensure not running old scripts
 V_REVERSE=''
 V_VIDOFF=''
 case "$(basename $0)" in
   build_image.sh|build_platform_packages.sh|customize_rootfs.sh|make_chroot.sh)
@@ skipping 214 matching lines @@
   path=${1:?}
   shift
 
   if ! sudo umount -d "${path}"; then
     warn "Failed to unmount ${path}"
     warn "Doing a lazy unmount"
 
     sudo umount -d -l "${path}" || die "Failed to lazily unmount ${path}"
   fi
 }