Switch the 13 near-standard/outlier modules to configure-provided
substitution (same template as the standard modules):
srcdir = @srcdir@
VPATH = @srcdir@
MAGICDIR = @top_builddir@
Their sibling-object refs (${MAGICDIR}/<mod>/lib*.o) and custom rules are
unchanged: ${MAGICDIR} = @top_builddir@ (the build top) so the sibling
objects resolve into the build tree, and $(srcdir) now comes from
@srcdir@ instead of the derivation.
Verified out-of-tree: `make modules libs` builds all 33 module libraries;
the five Tcl auto-load libraries (magiclef.so, tclplot.so, tclroute.so,
exttospice.so, exttosim.so) link (sibling refs resolve to the build top).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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