8200115: System property java.vm.vendor value includes quotation marks

Reviewed-by: tbell, asaha

src/share/vm/runtime/vm_version.cpp

@@ -140,7 +140,7 @@ const char* Abstract_VM_Version::vm_name() {
 
 const char* Abstract_VM_Version::vm_vendor() {
 #ifdef VENDOR
-  return XSTR(VENDOR);
+  return VENDOR;
 #else
   return JDK_Version::is_gte_jdk17x_version() ?
     "Oracle Corporation" : "Sun Microsystems Inc.";