Trivial RFR: 8039891: Remove ppcsflt builds from JPRT

[David Holmes]

Subject says it all, these builds (only used by SE Embedded) are no 
longer needed.

http://cr.openjdk.java.net/~dholmes/8039891/webrev/

I'll be pushing this via jdk9/hs-rt and backporting to 8u and 7u.

Thanks,
David