IBIS simulations broken

Description

IBIS simulations appear to be broken in nightly and recent 7.0.x versions. Spice models are not generated properly for the IBIS models.

Coarse bisection with a known-good IBIS demo project (worked in 7.0.0) shows:

• works in 7.0.0
• works in 7.0.5
• broken in 7.0.6
• broken in 7.0.7
• broken in a recent 7.0.9-testing
• broken in 7.99 (version below)

Steps to reproduce

1. Open demo linked above
2. open simulator
3. (7.0.x only) press run simulation
4. If the simulation worked, observe no errors in the ngspice log. Add the PRBS_OUTPUT signal to check that it worked right.
5. observe errors in the ngspice log
6. Open Simulation -> Show SPICE netlist, note locations of generated spice models in your cache
7. Check contents of those generated SPICE model files, observe that they are empty files

KiCad Version

Application: KiCad Schematic Editor arm64 on arm64

Version: 7.99.0-3719-g4fe755854f, release build

Libraries:
	wxWidgets 3.2.4
	FreeType 2.13.2
	HarfBuzz 8.2.0
	FontConfig 2.14.2

Platform: macOS Monterey Version 12.7.1 (Build 21G920), 64 bit, Little endian, wxMac

	wxWidgets: 3.2.4 (wchar_t,wx containers)
	Boost: 1.82.0
	OCC: 7.7.2
	Curl: 7.87.0
	ngspice: 41
	Compiler: Clang 14.0.3 with C++ ABI 1002

Build settings: