Old Compiler Warning Cleanup (GCC 4.0.2)

test.c:
1. Removed pragma disabling the warning for unused functions.
2. Fixed the guards around the function that wasn't getting removed from
   the build. And matched the guards to the call of the function. The
   issue is a test that fails only in a cert 3389 build using Arm
   assembly single-precision public keys.
3. Fixed the guards around a couple other functions.