Fix gplan.so: use armv7 binary from official 1.6.6 release
The gplan.so (CAMotics G-code planner) must be a 32-bit ARM binary matching the Pi's Python 3.5. Source it from the official release package rather than cross-compiling (SCons ignores CC/CXX overrides). Also revert install.sh gplan.so preservation logic — simpler to just ship the correct binary in the package.
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