The compiler -pg option implies -fno-ret-protector, as we want to disable

retguard and similar when profiling.  However, that missed all the .S files,
as ${PROF} wasn't added when ${NORMAL_S} was converted from direct invocation
of ${AS} to instead use ${CC}.  Similarly, mcount.o still had retguards
as it cannot be built with -pg.  So: pass ${PROF} when compiling .S files,
and compile "no profiling" files with -fno-ret-protector on archs with
retguard.

feedback and ok mpi@ mortimer@

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