Support both Unicode and non-Unicode builds

Author: robmen

src/Nerdbank.GitVersioning.Tasks/NativeVersionInfo.cs

@@ -24,6 +24,12 @@ the code is regenerated.
 ------------------------------------------------------------------------------
 ";
 
+        private const string VersionStringDefineContent = @"#if defined(_UNICODE)
+#define NBGV_VERSION_STRING(x) L ##x
+#else
+#define NBGV_VERSION_STRING(x) x
+#endif";
+
         private const string VersionInfoContent = @"#ifdef RC_INVOKED
 
 #include <winres.h>
@@ -107,6 +113,9 @@ public override bool Execute()
                 this.generator.AddComment(FileHeaderComment);
                 this.generator.AddBlankLine();
 
+                this.generator.AddContent(VersionStringDefineContent);
+                this.generator.AddBlankLine();
+
                 this.CreateDefines();
                 this.generator.AddBlankLine();
 
@@ -271,9 +280,9 @@ internal void AddDefine(string name, int value)
 
             internal void AddDefine(string name, string value)
             {
-                var escapedValue = "\"" + value.Replace("\\", "\\\\") + "\"";
+                var escapedValue = value.Replace("\\", "\\\\");
 
-                this.codeBuilder.AppendLine($"#define {name} {escapedValue}");
+                this.codeBuilder.AppendLine($"#define {name} NBGV_VERSION_STRING(\"{escapedValue}\")");
             }
 
             internal void EndFile()