sstate: Avoid contention between sstate packages

If several sstate packages are decompressing at the same time, they can
conflict over the "fixmepath". If two packages try to write to this at
the same time it results in an error. To avoid this we remove the file
once we've finished processing it.

(From OE-Core rev: c08d7093bf654ffedb155c5627972e9ecfeb0b60)

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

meta/classes/sstate.bbclass

@@ -183,6 +183,9 @@ def sstate_installpkg(ss, d):
             os.system("sed -i -e s:FIXMESTAGINGDIRTARGET:%s:g %s" % (staging_target, sstateinst + file))
             os.system("sed -i -e s:FIXMESTAGINGDIRHOST:%s:g %s" % (staging_host, sstateinst + file))
             os.system("sed -i -e s:FIXMESTAGINGDIR:%s:g %s" % (staging, sstateinst + file))
+        # Need to remove this or we'd copy it into the target directory and may 
+        # conflict with another writer
+        os.remove(fixmefn)
 
     for state in ss['dirs']:
         prepdir(state[1])