[OE-core] TMPDIR while building OE-Core

[Xu, Dongxiao]

Hi List,

While building the pure OE-Core, I found there are two TMPDIRs, one is
tmp-eglibc, another is tmp-eglibc-eglibc, any reason that make this
result? My local.conf is like:

BB_NUMBER_THREADS = "8"
PARALLEL_MAKE = "-j 8"
MACHINE ??= "qemuarm"
PACKAGE_CLASSES ?= "package_rpm"
EXTRA_IMAGE_FEATURES = "debug-tweaks"
USER_CLASSES ?= "buildstats image-mklibs image-prelink"
PATCHRESOLVE = "noop"
CONF_VERSION = "1"

Thanks,
Dongxiao