glib-2.0: relocate the GIO module directory for native builds

glib-2.0: relocate the GIO module directory for native builds

Glib hard-codes the install path in search path for GIO modules, which causes
problems when glib-2.0-native is restored from sstate with a different build
directory.

In the future we should relocate symbols directly using the same system that the
eSDK uses, but for now use dladdr() to look up where the library was loaded from
to build the search path.

(From OE-Core rev: 0a009dbfff32566341b2888530423f90f1b3d945)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>