Added shebang lines and executable flags to all checks scripts

Author: radarhere

checks/check_fli_oob.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import annotations
 
 from PIL import Image

checks/check_fli_overflow.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import annotations
 
 from PIL import Image

checks/check_icns_dos.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # Tests potential DOS of IcnsImagePlugin with 0 length block.
 # Run from anywhere that PIL is importable.
 from __future__ import annotations

checks/check_j2k_dos.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # Tests potential DOS of Jpeg2kImagePlugin with 0 length block.
 # Run from anywhere that PIL is importable.
 from __future__ import annotations

checks/check_j2k_leaks.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import annotations
 
 import sys

checks/check_j2k_overflow.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import annotations
 
 from pathlib import Path

checks/check_jp2_overflow.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 # Reproductions/tests for OOB read errors in FliDecode.c
 
 # When run in python, all of these images should fail for

checks/check_jpeg_leaks.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import annotations
 
 import sys

checks/check_large_memory.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import annotations
 
 import sys

checks/check_large_memory_numpy.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import annotations
 
 import sys