RFR: JDK-8069540: Remove universal binaries support from hotspot build

[Erik Joelsson]

Hello,

The hotspot native libraries on macosx are currently being packaged as 
"universal binaries" (while all other libraries and executables are 
not). There seems to be no point in doing so since we only build for one 
architecture anyway. I believe this is just something that was never 
cleaned up a long time ago and has just been around since. In the new 
hotspot build, we duplicated the behavior with the intention of removing 
it later. That time has now come.

I have verified that a hotspot job for macosx still works.

Bug: https://bugs.openjdk.java.net/browse/JDK-8069540

Webrev: http://cr.openjdk.java.net/~erikj/8069540/webrev.01/

/Erik