OpenEmbedded/Yocto layer for Go language support

PLEASE NOTE: Starting with OE-Core 'rocko' (Yocto Project 2.4), Go support is available directly in OE-Core, and meta-golang is no longer under active development.

Converting to OE-Core's Go support

1. Change inherit golang to inherit go.

2. Set the S variable, usually to "${WORKDIR}/git". The go.bbclass does not set S for you.

3. Set the GO_IMPORT variable to the import path of the Go package being built. In most cases, this is the same as what you set GO_SRCROOT when using inherit golang.

4. Source file/path references are now based off ${B} instead of ${B}/src. If you used ${GO_SRCROOT} with your meta-golang-based recipes, recplacing that with src/${GO_IMPORT} is usually sufficient.

5. If you used multiple repositories in your SRC_URI for 'vendoring' in other packages, you will need to change the destsuffix= parameter for the vendored packages from ${GO_SRCROOT} to git/src/${GO_IMPORT}.