URGENT: RFR: JDK-8032632: Wrong version for the first jdk8 fcs build

[Erik Joelsson]

Please review this simple fix for JDK8. When building the first fcs 
build, a version string error was discovered. The fix is simple.

Webrev: http://cr.openjdk.java.net/~erikj/8032632/webrev.root.01/
Bug: https://bugs.openjdk.java.net/browse/JDK-8032632

This fix restores the logic to the way it works in JDK7 where it looks 
like this in jdk/make/common/shared/Defs.gmk:

ifneq ($(MILESTONE),fcs)
   RELEASE      = $(JDK_VERSION)-$(MILESTONE)$(BUILD_VARIANT_RELEASE)
else
   RELEASE      = $(JDK_VERSION)$(BUILD_VARIANT_RELEASE)
endif

Note that MILESTONE is never empty in either 7 or 8 because it's set to 
"internal" before the conditional in either case, so the current 
conditional in JDK8 is just wrong.

/Erik