Overflow on 32 bits platforms.

[kevina]

I am not sure why this wasn't a problem before but this constant:

const MaxLength = 1 << 32

should probably change to

const MaxLength = math.MaxInt32

Otherwise we will get these errors:

[go-ipfs] Running shell script
+ go build -i -ldflags=-X github.com/ipfs/go-ipfs/repo/config.CurrentCommit=pr-5553-5 -o cmd/ipfs/ipfs github.com/ipfs/go-ipfs/cmd/ipfs
# gx/ipfs/QmUQy76yspPa3fRyY3GzXFTg9n8JVwFru6ue3KFRt4MeTw/go-buffer-pool
../../../gx/ipfs/QmUQy76yspPa3fRyY3GzXFTg9n8JVwFru6ue3KFRt4MeTw/go-buffer-pool/pool.go:55:12: constant 4294967296 overflows int
../../../gx/ipfs/QmUQy76yspPa3fRyY3GzXFTg9n8JVwFru6ue3KFRt4MeTw/go-buffer-pool/pool.go:68:31: constant 4294967296 overflows int
script returned exit code 2

[bonedaddy]

Running into this issue trying to build for linux/arm and linux/386 https://travis-ci.com/RTradeLtd/Temporal/builds/95589849

[anacrolix]

@postables You have vendored 0.1.1. This fix was included in 0.1.2.