[MacPorts] #29906: go @57.1 Patch for GOROOT, violate_mtree, etc

[MacPorts]

#29906: go @57.1 Patch for GOROOT, violate_mtree, etc
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 Reporter:  gaochangjian@…          |       Owner:  macports-tickets@…                   
     Type:  defect                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.9.2                                
 Keywords:  haspatch                |        Port:  go                                   
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 According to [http://golang.org/doc/install.html#environment official
 document], {{{GOROOT}}} is "the root of Go tree", it impact of linker,
 {{{gomake}}}, {{{godoc}}}, {{{goinstall}}} and so on. Current port sets
 {{{GOROOT}}} to {{{${prefix}}}} (usually {{{/opt/local}}}, through
 {{{GOROOT_FINAL}}} environment variable during build phase). It's
 inconvenient, cause we must violate the standard file hierarchy, and do
 some tricks like #29321.

 This patch try to unify the location of {{{GOROOT}}}. Meanwhile, tell user
 to set {{{GOBIN}}} environment variable in their shell profile, cause
 {{{gomake install}}} may need this.

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Ticket URL: <https://trac.macports.org/ticket/29906>
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