This also adds a config option GOLANG_BUILD_CACHE_DIR to customize the
location of the build cache directory.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

Fix install phase for this package: use variable GO_PKG_BUILD_BIN_DIR
instead of GO_PKG_BUILD_DIR.

Signed-off-by: Marek Behún <kabel@blackhole.sk>

The current version fails to build on mips and also on mipsel, but the
the latter is not masked.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>

Signed-off-by: Javier Marcet <javier@marcet.info>