I was writing the trace function, which is included by Whippet, which
doesn't have the BUILDING_LIBGUILE define. It is just as fine to put
these in private headers; better, even.
* libguile/frames-internal.h:
* libguile/values-internal.h: New files.
* libguile/Makefile.am (noinst_HEADERS): Add new files.
* libguile/backtrace.c:
* libguile/continuations.c:
* libguile/control.c:
* libguile/eval.c:
* libguile/frames.c:
* libguile/frames.h:
* libguile/gsubr.c:
* libguile/init.c:
* libguile/intrinsics.c:
* libguile/numbers.c:
* libguile/print.c:
* libguile/smob.c:
* libguile/smob.h:
* libguile/stacks.c:
* libguile/stacks.h:
* libguile/values.c:
* libguile/values.h:
* libguile/vm.c: Include new files.
