Linux: add launcher script to fix issue launching on Steam

The steam environment sets LD_LIBRARY_PATH with a libtbb.so.2 that is
incompatible with our own. This wrapper scripts gives our own library
priority.

There is a more modern "Steam Linux Runtime" that can be used instead of
the "LD_LIBRARY_PATH Steam Runtime" and which launches Blender, but it
fails to detect GPU compute libraries. So that was not an option.

Ref #107385

Pull Request: https://projects.blender.org/blender/blender/pulls/109169

release/bin/blender-launcher

@@ -0,0 +1,12 @@
+#!/bin/sh
+BF_DIST_BIN=$(dirname "$0")
+BF_PROGRAM="blender"
+
+# Add own lib folder first, because Steam or other environments may set an
+# LD_LIBRARY_PATH that has priority over the runpath in the Blender excutable,
+# but contains incompatible libraries.
+LD_LIBRARY_PATH=${BF_DIST_BIN}/lib:${LD_LIBRARY_PATH}
+
+export LD_LIBRARY_PATH
+
+exec "$BF_DIST_BIN/$BF_PROGRAM" ${1+"$@"}