Merge pull request #3848 from blattms/binary-package-version-no-buildtime

Use empty string for buildtime if BUILD_TIMESTAMP is not set.

opm/simulators/utils/moduleVersion.cpp

@@ -51,7 +51,11 @@ namespace Opm
     /// the binary was compiled.
     std::string compileTimestamp()
     {
+#ifdef BUILD_TIMESTAMP
         return BUILD_TIMESTAMP;
+#else
+        return "";
+#endif
     }
 
 } // namespace Opm