fix(build): recompile devprof when runt.h changes

[Ticed]

devprof.c includes runt.h but the emu/port/portmkfile rules did
not declare devprof.$O: $RUNT. When runt.h regenerates, devprof.$O is not rebuilt, so the emulator can end up
linked against a stale devprof object.

This adds the missing dependency alongside the existing devprog.$O: $RUNT / devsrv.$O: $RUNT entries.

Companion to the downstream fix in NERVsystems#163 — same dependency gap exists here.

[pdfinn]

Thanks for this, @Ticed — verified the dependency was indeed missing (devprof.c:6 includes runt.h, and portmkfile:135-138 declares the $RUNT dep for every other runt.h-including source except this one). Clean fix, matches the surrounding style. Cross-checked against NERVsystems#163 — this PR is the complete applicable subset for this repo (the QUICKSTART.md stale-path fix from that PR doesn't apply here, our copy is already correct on line 123). Approved CI.