[yocto] Installing the SDKs made with meta-mingw

[Matt Hoosier]

Hi,

I've successfully built a Canadian-cross SDK using the meta-mingw layer.
Very nice!

Because the layer lobotomizes the SDK_PACKAGING_FUNC when ${SDKMACHINE} is
set to a MinGW host, though, the resulting SDK is not encapsulated into the
self-extracting tarball and the corresponding relocation logic (
relocate_sdk.py and so forth) is omitted.

Any suggestions on how to do the last-mile work to use the SDK on Windows?
Or perhaps nothing is needed at all, except adjusting the prefixes built
into environment-setup-<arch>? Although that would be nice, I think at
least some installation-time adjustment is necessary though; when I do:

    arm-poky-linux-gnueabi-gcc -o foo foo.c
--sysroot=d:/projects/yocto-sdk/sysroots/cortexa15t2hf-vfp-neon-poky-linux-gnueabi

, the following happens during linking:

    ld.exe: cannot find /lib/libc.so.6 inside
d:/projects/yocto-sdk/sysroots/cortexa15t2hf-vfp-neon-poky-linux-gnueabi

Cheers,
Matt
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