int/uint overflows when compiling for 32-bit targets

[artob]

Compiling the master branch (at 5105380) for the armeabi-v7a target, the compiler bails out at the following problems:

# github.com/Azure/golua/pkg/packer
github.com/Azure/golua/pkg/packer/scan.go:222:52: constant 1844674407370955161 overflows uint
# github.com/Azure/golua/std/math
github.com/Azure/golua/std/math/math.go:61:12: constant 9223372036854775807 overflows int
github.com/Azure/golua/std/math/math.go:65:12: constant -9223372036854775808 overflows int

Looks like it might be helpful to add a 32-bit target (x86 or ARM) to your test plan.

[artob]

Bump?