Remove darwin/386 from supported platforms

[Go no longer supports darwin/386 (MacOS 32-bit apps), as of Go 1.15][1]

[1]: golang/go#37610

Author: johnboyes

build/make.go

@@ -262,8 +262,7 @@ var verbose = flag.Bool("verbose", false, "Print verbose details")
 
 var (
 	platformEnvs = []map[string]string{ //nolint:gochecknoglobals
-		map[string]string{GOARCH: X86, GOOS: DARWIN, CGO_ENABLED: "0"}, //nolint:gofmt
-		map[string]string{GOARCH: X86_64, GOOS: DARWIN, CGO_ENABLED: "0"},
+		map[string]string{GOARCH: X86_64, GOOS: DARWIN, CGO_ENABLED: "0"}, //nolint:gofmt
 		map[string]string{GOARCH: X86, GOOS: LINUX, CGO_ENABLED: "0"},
 		map[string]string{GOARCH: X86_64, GOOS: LINUX, CGO_ENABLED: "0"},
 		map[string]string{GOARCH: X86, GOOS: WINDOWS, CGO_ENABLED: "0"},