[build] Introduce an embedder version string

src/version.h

Index: src/version.h
diff --git a/src/version.h b/src/version.h
index 3395d7f4fe5589ff2afee64c0f7c353bb414e05d..20d9c71fe76661168b5e510a32f0bd3e25fb1f62 100644
--- a/src/version.h
+++ b/src/version.h
@@ -18,6 +18,7 @@ class Version {
   static int GetMinor() { return minor_; }
   static int GetBuild() { return build_; }
   static int GetPatch() { return patch_; }
+  static const char* GetEmbedder() { return embedder_; }
   static bool IsCandidate() { return candidate_; }
   static uint32_t Hash() {
     return static_cast<uint32_t>(
@@ -38,13 +39,15 @@ class Version {
   static int minor_;
   static int build_;
   static int patch_;
+  static const char* embedder_;
   static bool candidate_;
   static const char* soname_;
   static const char* version_string_;
 
   // In test-version.cc.
   friend void SetVersion(int major, int minor, int build, int patch,
-                         bool candidate, const char* soname);
+                         const char* embedder, bool candidate,
+                         const char* soname);
 };
 
 }  // namespace internal