The introduction of sstate and recipe specific sysroots made the configure
prepends obsolete and unneeded. The compile prepend has been there for over
a decade and is also likely obsolete. Remove the whole lot, we look into any
issues that arise.
(From OE-Core rev: d6a22998e47bcceee3fc3edc72eb2df2970dabfa)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>