Fix: Modiy throttle.c for Solaris/Illumos

Add to LDFLAGS "-lssp_nonshared"  to support flag -fstack-protector-all with gcc 4.4 of Illumos.

Procfs is available in Solaris/Illumos but in binary form. The contents must be read with the structures defined in procfs.h.

It compiles now with watchdog feature but will fail when used.
Further changes will be done when the feature is in stable condition.