Limit build targets

By default xgo will try and build the specified package to all platforms and architectures supported by the underlying Go runtime. If you wish to restrict the build to only a few target systems, use the comma separated --targets CLI argument:

• --targets=linux/arm: builds only the ARMv5 Linux binaries (arm-6/arm-7 allowed)
• --targets=windows/*,darwin/*: builds all Windows and OSX binaries
• --targets=*/arm: builds ARM binaries for all platforms
• --targets=*/*: builds all suppoted targets (default)

The supported targets are:

• Platforms: darwin, linux, windows
• Achitectures: 386, amd64, arm-5, arm-6, arm-7, arm64, mips, mipsle, mips64, mips64le, ppc64le, s390x