cmd/dist: make zosarch.go deterministic
cmd/dist: make zosarch.go deterministic

Currently zosarch.go is written out in non-deterministic map order.
Sort the keys and write it out in sorted order to make the generated
file contents deterministic.

Change-Id: Id490f0e8665a2c619c5a7a00a30f4fc64f333258
Reviewed-on: https://go-review.googlesource.com/24174
Run-TryBot: Austin Clements <7ea35d812706d9213868749011af1ed4fa2f6aa0@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

derekmarcotte/go,CAFxX/go,polyverse-security/go,suncycheng/go,suncycheng/go,CAFxX/go,josharian/go,nawawi/go,linux-on-ibm-z/go,codestation/go,vsekhar/elastic-go,josharian/go,CAFxX/go,cloudflare/go,ImJasonH/go,Cofyc/go,goodlang/good,nawawi/go,ImJasonH/go,ImJasonH/go,akutz/go,goodlang/good,codestation/go,Cofyc/go,CAFxX/go,ImJasonH/go,akutz/go,theif519/go,ImJasonH/go,cloudflare/go,suncycheng/go,linux-on-ibm-z/go,derekmarcotte/go,polyverse-security/go,golang/go,polyverse-security/go,4ad/go,golang/go,vsekhar/elastic-go,cloudflare/go,4ad/go,golang/go,momchil-velikov/go,ImJasonH/go,nawawi/go,josharian/go,golang/go,golang/go,akutz/go,4ad/go,linux-on-ibm-z/go,linux-on-ibm-z/go,Cofyc/go,ImJasonH/go,CAFxX/go,Cofyc/go,Cofyc/go,polyverse-security/go,polyverse-security/go,golang/go,nawawi/go,christopher-henderson/Go,momchil-velikov/go,theif519/go,Cofyc/go,polyverse-security/go,linux-on-ibm-z/go,derekmarcotte/go,4ad/go,suncycheng/go,vsekhar/elastic-go,josharian/go,vsekhar/elastic-go,josharian/go,akutz/go,derekmarcotte/go,derekmarcotte/go,CAFxX/go,codestation/go,nawawi/go,derekmarcotte/go,theif519/go,vsekhar/elastic-go,nawawi/go,goodlang/good,CAFxX/go,cloudflare/go,cloudflare/go,cloudflare/go,nawawi/go,codestation/go,goodlang/good,golang/go,vsekhar/elastic-go,cloudflare/go,theif519/go,suncycheng/go,derekmarcotte/go,goodlang/good,Cofyc/go,goodlang/good,codestation/go,momchil-velikov/go,suncycheng/go,akutz/go,linux-on-ibm-z/go,akutz/go,goodlang/good,golang/go,derekmarcotte/go,josharian/go,codestation/go,theif519/go,Cofyc/go,momchil-velikov/go,momchil-velikov/go,akutz/go,vsekhar/elastic-go,codestation/go,theif519/go,akutz/go,momchil-velikov/go,josharian/go,nawawi/go,suncycheng/go,vsekhar/elastic-go,4ad/go,polyverse-security/go,4ad/go,suncycheng/go,polyverse-security/go,theif519/go,linux-on-ibm-z/go,cloudflare/go,4ad/go,momchil-velikov/go,momchil-velikov/go,linux-on-ibm-z/go,josharian/go,4ad/go,theif519/go,CAFxX/go,goodlang/good,ImJasonH/go,codestation/go