URGENT RFR: 8041141: JDK9 emb build failure on PPC platform

[David Holmes]

http://cr.openjdk.java.net/~dholmes/8041141/webrev/

The recent changes to convert warnings to errors didn't account for some 
type-punning warnings in our Embedded PPC build due to the use of 
strict-aliasing. Really we shouldn't be using strict-aliasing so this 
change (which for some reason is in the open flags.m4 file) brings ppc 
in-line with all other platforms and sets -fno-strict-aliasing

I will be pushing this to jdk9/dev as we need this fixed immediately.

Thanks,
David