Pass target properties to signing

Author: hoyosjs

src/installer/signing/Directory.Build.targets

@@ -28,6 +28,8 @@
         ArtifactsBinDir=$(ArtifactsBinDir);
         ArtifactsPackagesDir=$(ArtifactsPackagesDir);
         TargetOS=$(TargetOS);
+        TargetsLinux=$(TargetsLinux);
+        TargetsWindows=$(TargetsWindows);
         TargetArchitecture=$(TargetArchitecture);
         BuildArchitecture=$(BuildArchitecture);
         NetCoreAppCurrent=$(NetCoreAppCurrent)" />