We really want the same sstate checksums for pseudo-native on 32 and 64 bit platforms
but the use of SITEINFO_BITS prevents this. Since other things would change if
the bit size changes, we can safely exclude this variable and rely on others
(e.g. BUILD_ARCH included in WORKDIR) to handle this.
[YOCTO #5970]
(From OE-Core rev: 4caf6187bb52d4f6f92ea0959e90339b82ac92b8)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>