media-gfx/orcaslicer-bin: add 2.4.2-r1, drop 2.4.2

AppRun execs libexec/orca-slicer-env, which doins installed without the
executable bit, so starting the slicer failed with Permission denied.

Closes: https://bugs.gentoo.org/980825
Signed-off-by: Huang Rui <vowstar@gmail.com>

media-gfx/orcaslicer-bin/orcaslicer-bin-2.4.2-r1.ebuild

@@ -88,6 +88,7 @@ src_install() {
 	# Make binaries executable
 	fperms +x /opt/${PN}/AppRun
 	fperms +x /opt/${PN}/bin/orca-slicer
+	fperms +x /opt/${PN}/libexec/orca-slicer-env
 
 	# Find and make all .so files executable
 	find "${ED}/opt/${PN}" -name "*.so*" -exec chmod +x {} \;