fragments/autobuilder: add go to SDK_TOOLCHAIN_LANGS

fragments/autobuilder: add go to SDK_TOOLCHAIN_LANGS

For reasons unknown, only rust was listed, which means
nativesdk-go was not built or tested, which lead to
breakage like one fixed in
https://git.yoctoproject.org/poky/commit/?id=a669cd2e0c760da9d7e872daea9590fc9e86d766

Note that with this change only building and installing go
into SDKsis tested, but no tests are performed with the
toolchain itself in testsdk/testimage.

For that, a bug has been filed:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=15953

Remove go from x32 and mingw targets as it will not build for them.
(next to similar removals for rust)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>