Import LinuxCNC source tree

tests/twopass/skip

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+#!/bin/bash
+# haltcl needs the Tcl HAL extension (tcl/hal.so), which is only built
+# in GUI builds (BUILD_GUI); skip in headless builds.  The tcl dir is
+# taken from TCLLIBPATH (exported by rip-environment).
+set -u
+
+if ! command -v tclsh >/dev/null 2>&1; then
+    echo "skip: tclsh not installed" >&2
+    exit 1
+fi
+
+read -r tcldir _ <<< "${TCLLIBPATH:-}"
+if ! [ -f "${tcldir:-/nonexistent}/hal.so" ]; then
+    echo "skip: Tcl HAL extension not built (headless build)" >&2
+    exit 1
+fi
+
+exit 0