epm repack generic: fatal if no executable binaries found (eterbug #17820)

repack.d/generic.sh

@@ -22,6 +22,7 @@ done
 for i in $BUILDROOT/usr/bin/* ; do
     [ -L "$i" ] && continue
     [ -f "$i" ] || continue
+    [ -x "$i" ] || fatal "file ${i#$BUILDROOT} is not executable"
     grep -Eq '^#!/usr/bin/python|^#!/usr/bin/env python' $i && flag_python3=1
     subst 's|^#!/usr/bin/python$|#!/usr/bin/python3|' $i
     subst 's|^#!/usr/bin/env python$|#!/usr/bin/env python3|' $i