fix hack/lib/golang.sh for bash 4.3

[adisky]

What type of PR is this?

/kind bug

What this PR does / why we need it:
This PR fixes compatibiltiy issue with bash version 4.3 for script hack/lib/golang.sh, to solve the scope issue of readonly variables in both version 4.3 and 4.4, required variables are declared using declare -g

Which issue(s) this PR fixes:

Fixes #77521

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[adisky]

/test pull-kubernetes-e2e-gce

[adisky]

/test pull-kubernetes-integration

[dims]

w00t interesting! thanks for taking this on @adisky

[adisky]

@dims Tried fixing the scope resolution problem for readonly variable for bash version 4.3, tested the above changes on bash 4.4, trying to get it tested on 4.3

[adisky]

cc @cjschaef @aojea

[aojea]

Thanks @adisky , it's working for me now

[adisky]

/sig release

[adisky]

/assign @cblecker @spiffxp @dims

[spiffxp]

/priority critical-urgent
/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adisky, spiffxp

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• hack/OWNERS [spiffxp]

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[tpepper]

This has broken MacOS build:

/Users/tpepper/src/github.com/kubernetes/kubernetes/hack/lib/golang.sh: line 166: declare: -g: invalid option
declare: usage: declare [-afFirtx] [-p] [name[=value] ...]
!!! [0517 10:55:19] Call tree:
!!! [0517 10:55:19]  1: /Users/tpepper/src/github.com/kubernetes/kubernetes/hack/lib/init.sh:55 source(...)
!!! [0517 10:55:19]  2: build/../build/common.sh:37 source(...)
!!! [0517 10:55:19]  3: build/release.sh:29 source(...)
make: *** [quick-release] Error 1

[aojea]

This discussion seems related https://discuss.kubernetes.io/t/help-wanted-role-build-and-shell-cleanup/6064/10 , is it failing with the default bash version on Mac? version 3?