Fix Splinefont shell invocation #5367
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This patch addresses security vulnerabilities arising from how FontForge opens certain files. The code has been changed to use glib's
g_spawn_sync/asyncfunctions that do not execute commands through a shell. This patch should still retain all of the original functionality and introduce no breaking changes, having passed all tests as well.As discussed with the maintainers via email, opening a public PR here.
Addresses CVES:
Type of change