Fix Nuget nuspec files UTF-16 encoding issue

build/utils/dotnet/dependencies/packagesconfig.go

@@ -218,9 +218,11 @@ func createNugetPackage(packagesPath string, nuget xmlPackage, nPackage *nugetPa
 	if err != nil {
 		return nil, err
 	}
-
+	// Sometimes the nuspec file is wrongly encoded in utf-16, the actual encoding is utf-8 but the xml header has 'enocding="utf-16"' key.
+	// xml.Unmarshal doesn't support utf-16 encoding, so we need to convert the header to utf-8.
+	utf8String := strings.Replace(string(nuspecContent), "utf-16", "utf-8", 1)
 	nuspec := &nuspec{}
-	err = xml.Unmarshal(nuspecContent, nuspec)
+	err = xml.Unmarshal([]byte(utf8String), nuspec)
 	if err != nil {
 		pack := nPackage.id + ":" + nPackage.version
 		log.Warn("Package:", pack, "couldn't be parsed due to:", err.Error(), ". Skipping the package dependency.")

build/utils/dotnet/dependencies/testdata/packagesproject/localcache/id2/2.0.0/id2.nuspec

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-16"?>
 <package>
   <metadata>
     <id>id2</id>