uninative: Ensure uninative is enabled in all cases for BuildStarted event

Recent changes in bitbake mean the datastore is not always reset between
ConfigParsed and BuildStarted. This means in a fresh buiild, with memory
resident bitbake active, uninative may end up disabled.

Update the code so the enable code is always run at BuildStarted if
needed.

(From OE-Core rev: db743cc78fe5172bb4a4dac9c1dad4f5aa9e1491)

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

meta/classes-global/uninative.bbclass

@@ -40,6 +40,8 @@ python uninative_event_fetchloader() {
         with open(loaderchksum, "r") as f:
             readchksum = f.read().strip()
         if readchksum == chksum:
+            if "uninative" not in d.getVar("SSTATEPOSTUNPACKFUNCS"):
+                enable_uninative(d)
             return
 
     import subprocess