radv: don't use python 3.9 feature in radv_annotate_layer_gen.py

This commit adds an implementation of removesuffix so we don't
need the 'str' one which was added in 3.9.

Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Acked-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28831>

src/amd/vulkan/layers/radv_annotate_layer_gen.py

@@ -52,6 +52,18 @@ annotate_${c.name}(${c.decl_params()})
 % endfor
 """)
 
+# str.removesuffix requires python 3.9+ so implement our own to not break build
+# on older versions
+def removesuffix(s, suffix):
+    l = len(suffix)
+    if l == 0:
+        return s
+    idx = s.find(suffix)
+    if idx == len(s) - l:
+        return s[:-l]
+    return s
+
+
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument("--out-c", required=True, help="Output C file.")
@@ -67,7 +79,7 @@ def main():
         if not e.name.startswith('Cmd') or e.alias or e.return_type != "void":
             continue
 
-        stripped_name = e.name.removesuffix('EXT').removesuffix('KHR').removesuffix('2')
+        stripped_name = removesuffix(removesuffix(removesuffix(e.name, 'EXT'), 'KHR'), '2')
         if stripped_name in commands_names or stripped_name in EXCLUDED_COMMANDS:
             continue