Add redistribution guard

scripts/check_redistributable.py refuses NVIDIA binaries (by name and
version resource), NGX SDK headers, PTX and code objects, PTX translations
(marked by ptx2glsl.py/condense.py) and the engine's model data in the
repository, and in each release variant (clean/installer/full) whatever
that variant does not contain. package_release.sh runs it before zipping;
scripts/git-hooks/pre-commit runs it locally.

Signed-off-by: woutermans <[email protected]>

scripts/git-hooks/pre-commit

@@ -0,0 +1,5 @@
+#!/bin/sh
+# Refuses commits that add NVIDIA's files, code built from NVIDIA's PTX or values read from DLSS
+# (scripts/check_redistributable.py; see NOTICE). Enable once per clone:
+#   git config core.hooksPath scripts/git-hooks
+exec python3 "$(git rev-parse --show-toplevel)/scripts/check_redistributable.py" tree --staged