RFR: JDK-8143036: Make install target does not depend on images

[Erik Joelsson]

Make install target should depend on images. Somehow this dependency got 
lost in JDK-8054834.

Bug: https://bugs.openjdk.java.net/browse/JDK-8143036
Patch:
diff -r 106c06398f7a make/Main.gmk
--- a/make/Main.gmk
+++ b/make/Main.gmk
@@ -462,6 +462,8 @@

    test-image-jdk-jtreg-native: build-test-jdk-jtreg-native

+  install: product-images
+
  endif


/Erik