guile: Fix binary relocation issue for precompiled guile objects

guile: Fix binary relocation issue for precompiled guile objects

When guile-native was relocated, there were messages like:

;;; note: source file /srv/home/pokybuild/yocto-autobuilder/yocto-slave/emenlow/build/build/tmp/sysroots/x86_64-linux/usr/share/guile/2.0/ice-9/eval.scm
;;;       newer than compiled /srv/home/pokybuild/yocto-autobuilder/yocto-slave/fri2/build/build/tmp/sysroots/x86_64-linux/usr/lib/guile/2.0/ccache/ice-9/eval.go

and this confuses things like the autogen-native "guile --version"
check. This patch ensures the wrapper script sets the necessary
variables correctly.

(From OE-Core rev: 7a254d8294cfbe4b717d083c3d7fcc5515a5ab4f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>