[goxc] Failing build for Darwin on Go 1.15.x

[weldpua2008]

Hey there,

I am using the following command
goxc -tasks 'xc archive' -bc 'darwin linux' -d "$RELEASES_PATH" -resources-include 'README*' -build-ldflags="-X github.com/weldpua2008/supraworker/cmd.GitCommit=${TRAVIS_TAG} "

And with Go 1.15.x where they removed Darwin/386 I am getting:

$ goxc -tasks 'xc archive' -bc 'darwin linux' -d "$RELEASES_PATH" -resources-include 'README*' -build-ldflags="-X github.com/weldpua2008/supraworker/cmd.GitCommit=${TRAVIS_TAG} "
[goxc:xc] 2020/10/10 11:50:57 Parallelizing xc for 5 platforms, using max 1 of 2 processors
[goxc:xc] 2020/10/10 11:50:57 WARNING: LdFlagsXVars is nil. Not passing package version into compiler
cmd/go: unsupported GOOS/GOARCH pair darwin/386
[goxc:xc] 2020/10/10 11:50:57 'go' returned error: Wait error: exit status 2: cmd/go: unsupported GOOS/GOARCH pair darwin/386
[goxc:xc] 2020/10/10 11:50:57 Error: Wait error: exit status 2: cmd/go: unsupported GOOS/GOARCH pair darwin/386
[goxc:xc] 2020/10/10 11:50:57 Have you run `goxc -t` for this platform (386,darwin)???
[goxc:xc] 2020/10/10 11:50:57 WARNING: LdFlagsXVars is nil. Not passing package version into compiler
[goxc:xc] 2020/10/10 11:51:28 WARNING: LdFlagsXVars is nil. Not passing package version into compiler
[goxc:xc] 2020/10/10 11:51:58 WARNING: LdFlagsXVars is nil. Not passing package version into compiler
[goxc:xc] 2020/10/10 11:51:59 WARNING: LdFlagsXVars is nil. Not passing package version into compiler
[goxc:xc] 2020/10/10 11:52:29 Multiple errors (returning first one): [Wait error: exit status 2: cmd/go: unsupported GOOS/GOARCH pair darwin/386]
[goxc:xc] 2020/10/10 11:52:29 Stopping after 'xc' failed with error 'Wait error: exit status 2: cmd/go: unsupported GOOS/GOARCH pair darwin/386'
[goxc] 2020/10/10 11:52:29 RunTasks error: Wait error: exit status 2: cmd/go: unsupported GOOS/GOARCH pair darwin/386
The command "goxc -tasks 'xc archive' -bc 'darwin linux' -d "$RELEASES_PATH" -resources-include 'README*' -build-ldflags="-X github.com/weldpua2008/supraworker/cmd.GitCommit=${TRAVIS_TAG} "" failed and exited with 1 during .

the temporary solution was to use 1.14.x