RFR: JDK-8027698: Platform specific jars are not being signed by the sign-jars target

[Tim Bell]

Hi Erik:

> Please review this simple fix, adding sunmscapi.jar and ucrypto.jar to 
> the list of jars to be signed by the sign-jars target. Since these 
> jars are platform dependent, they aren't always present.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8027698
> Webrev: http://cr.openjdk.java.net/~erikj/8027698/webrev.jdk.01

Looks good to me.

Tim