go: split out go-runtime into separate recipe

Reorganize the Go toolchain build to split out
the Go standard runtime libraries into a separate
recipe.  This simplifies the extension to crosssdk
and cross-canadian builds.

* Adds a patch to the go build tool to prevent it
  from trying to rebuild anything in GOROOT, which
  is now resident in the target sysroot.

* 'go' bb and inc files are now for building the
  compiler for the target only.

* 'go-cross' bb and inc files are now just for
  the cross-compiler.

* Adds virtual/<prefix> PROVIDES for the compiler
  and runtime

* Removes testdata directories from the sysroot
  during staging, as they are unnecessary and
  can cause strip errors (some of the test files
  are ELF files).

* Re-enables pacakage QA checks, adding selective
  INSANE_SKIP settings where needed.

Signed-off-by: Matt Madison <matt@madison.systems>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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