Fix for 8014669, build flags issue

[Tim Bell]

Hi Bill:

> Some architecture dependent flags do not make it through to the 
> libjsig.so and libsaproc.so makefiles. As a result, the libs are not 
> compiled/linked with the correct flags for that particular variant. 
> Fix is to make sure EXTRA_CFLAGS propogates down correctly.
>
> http://cr.openjdk.java.net/~bpittore/8014669/webrev.00

Looks good to me on the build side..

Tim