Install schema should respect to GCONF_DISABLE_MAKEFILE_SCHEMA_INSTALL,
If GCONF_DISABLE_MAKEFILE_SCHEMA_INSTALL is set, the schema should not
be installed, but it always installed shema before, this was incorrect
and it would cause host contamination since it would read
$HOME/gconf/.gconf.
[YOCTO #2178]
Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
