xf86-video-vmware: fix build with automake 1.12.x

xf86-video-vmware: fix build with automake 1.12.x

automake 1.12.x automatically deletes empty directories, so
the additional rmdir from the do_install_append fails.

cleanup the do_install_append for automake 1.12.x

Fixes this build issue:

| rmdir: failed to remove
`/srv/home/nitin/builds/build-gcc47/tmp/work/i586-poky-linux/xf86-video-vmware-2_12.0.1-r17.1/image/usr/bin':
No such file or directory
NOTE: package xf86-video-vmware-2_12.0.1-r17.1: task do_install: Failed

No PR bump as no change in the output.

(From OE-Core rev: ae6cad80ea65b4e2ecbc15b94f66d874ee2400c7)

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>