go/build: rename WorkingDir to Dir

Fixes golang#36168

Change-Id: If2b7368671e83657a3a74dd030e66e7c68bf2361
Reviewed-on: https://go-review.googlesource.com/c/go/ /211657
Reviewed-by: Brad Fitzpatrick <[email protected]>
Reviewed-by: Jay Conrod <[email protected]>

[release-branch.go1.13] go1.13.5

Change-Id: I700055da44126e2dfa56f371f9e208f4f727bbed
Reviewed-on: https://go-review.googlesource.com/c/go/ /209898
Run-TryBot: Carlos Amedee <[email protected]>
Run-TryBot: Alexander Rakoczy <[email protected]>
Reviewed-by: Alexander Rakoczy <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

[release-branch.go1.12] go1.12.14

Change-Id: I3f3fcee395bd3f9bdb6ad4028506ac90fb84c388
Reviewed-on: https://go-review.googlesource.com/c/go/ /209897
Run-TryBot: Carlos Amedee <[email protected]>
Run-TryBot: Alexander Rakoczy <[email protected]>
Reviewed-by: Alexander Rakoczy <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

[release-branch.go1.13] go1.13.4

Change-Id: If01ea0da089ee94587a378d13b4a2ad1592f1ea7
Reviewed-on: https://go-review.googlesource.com/c/go/ /204642
Run-TryBot: Andrew Bonventre <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

[release-branch.go1.12] go1.12.13

Change-Id: Ic4db4625c4b7031aa08cb235f526267058a50430
Reviewed-on: https://go-review.googlesource.com/c/go/ /204641
Run-TryBot: Andrew Bonventre <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Alexander Rakoczy <[email protected]>

[release-branch.go1.13] go1.13.3

Change-Id: If3364685f08585e3679fb5239bda127f440af473
Reviewed-on: https://go-review.googlesource.com/c/go/ /201826
Run-TryBot: Alexander Rakoczy <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Katie Hockman <[email protected]>

[release-branch.go1.13-security] go1.13.2

Change-Id: I057434f66a07bd97e7608e171e48283423d89680
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/ /575987
Reviewed-by: Filippo Valsorda <[email protected]>

[release-branch.go1.12] go1.12.12

Change-Id: I3494e831beac93e322788f7bd76948b52f769f37
Reviewed-on: https://go-review.googlesource.com/c/go/ /201822
Run-TryBot: Alexander Rakoczy <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Katie Hockman <[email protected]>

[release-branch.go1.12-security] go1.12.11

Change-Id: I8421754104cb795270dbcb6f554ed3a78a719483
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/ /575988
Reviewed-by: Filippo Valsorda <[email protected]>

[release-branch.go1.13-security] go1.13.1

Change-Id: I371ff39537fc617a2462cc947dd717b53ede7bcc
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/ /558790
Reviewed-by: Dmitri Shuralyov <[email protected]>