bitbake.conf: add findutils-native to ASSUME_PROVIDED

It's possible for findutils-native to get built.  There's no point in this as
this is part of the expected host platform but this can introduce races or even
bugs (4.5.19 appears to have a leaking fd bug, resulting in asserts) so add it
to ASSUME_PROVIDED so it definitely won't get built.

(From OE-Core rev: b753dae334641480cb4a232ce240f9f56be5568f)

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

meta/conf/bitbake.conf

@@ -170,6 +170,7 @@ ASSUME_PROVIDED = "\
     bzip2-native \
     chrpath-native \
     file-native \
+    findutils-native \
     git-native \
     grep-native \
     diffstat-native \