switch net via build tags

Signed-off-by: leongross <leon.gross@9elements.com>

.gitmodules

@@ -35,3 +35,6 @@
 [submodule "lib/wasi-cli"]
     path = lib/wasi-cli
     url = https://github.com/WebAssembly/wasi-cli
+[submodule "src/net"]
+	path = src/net
+	url = https://github.com/tinygo-org/net

loader/goroot.go

@@ -236,14 +236,16 @@ func linuxNetworking(buildTags []string) bool {
 	return false
 }
 
-// The boolean indicates whether to merge the subdirs. True means merge, false
-// means use the TinyGo version.
+// The boolean indicates whether to merge the subdirs.
+//
+// True: Merge the golang and tinygo source directories.
+// False: Uses the TinyGo version exclusively.
 func pathsToOverride(goMinor int, buildTags []string) map[string]bool {
 	paths := map[string]bool{
-		"":                      true,
+		"":                      true, // root
 		"crypto/":               true,
 		"crypto/rand/":          false,
-		"crypto/tls/":           false,
+		"crypto/tls/":           false, // necessary for embedded tls
 		"device/":               false,
 		"examples/":             false,
 		"internal/":             true,
@@ -256,7 +258,7 @@ func pathsToOverride(goMinor int, buildTags []string) map[string]bool {
 		"internal/task/":        false,
 		"internal/wasi/":        false,
 		"machine/":              false,
-		"net/":                  true, // this is important if the GOOS is not linux
+		"net/":                  true, // this is important if the GOOS != linux
 		"net/http/":             false,
 		"os/":                   true,
 		"reflect/":              false,
@@ -276,15 +278,12 @@ func pathsToOverride(goMinor int, buildTags []string) map[string]bool {
 		paths["syscall/"] = true // include syscall/js
 	}
 
+	// To make sure the correct version of the net package is used, it is advised
+	// to clean the go cache before building
 	if linuxNetworking(buildTags) {
 		for _, v := range []string{"crypto/tls/", "net/http/", "net/"} {
 			delete(paths, v) // remove entries so go stdlib is used
 		}
-
-		// ensure that the goroot path does not contain the the tinygo net package
-		// path
-	} else {
-		// if the GOOS!=linux several tls files have to be for tls
 	}
 
 	return paths