Support Windows 32-bit system

[rts-gordon]

Description

Hi there,

Our system must build to a 32-bit execute program that run in Windows, we use golang 32-bit, MingW-W64 32-bit to build it and get a error, can you please take a look at this, many thanks.

GOOS=windows GOARCH=386 go build 
# github.com/confluentinc/confluent-kafka-go/v2/kafka
C:\Users\username\go\pkg\mod\github.com\confluentinc\confluent-kafka-go\[email protected]\kafka\message.go:212:31: invalid array length 1 << 31 (untyped int constant 2147483648)

if keyLen > 0 {
	copy((*[1 << 30]byte)(payload)[valueLen:allocLen], msg.Key)
	keyp = unsafe.Pointer(&((*[1 << 31]byte)(payload)[valueLen]))
}

Checklist

Please provide the following information:

• confluent-kafka-go (v2.3.0) and librdkafka version (``):
• Apache Kafka broker version: v3.5
• Operating system: Windows 10
• Golang v1.22.1 32-bit
• MinGW-W64-builds-5.0.0 32-bit