switch net via build tags

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

Author: leongross

.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

@@ -236,8 +236,10 @@ 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,
@@ -260,7 +262,7 @@ func pathsToOverride(goMinor int, buildTags []string) map[string]bool {
 		"internal/task/":              false,
 		"internal/wasi/":              false,
 		"machine/":                    false,
-		"net/":                        true,
+		"net/":                        true, // this is important if the GOOS != linux
 		"net/http/":                   false,
 		"os/":                         true,
 		"reflect/":                    false,
@@ -280,6 +282,8 @@ 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) // remote entries so go stdlib is used