Added build for gpep517 to install glad

patches/gpep517-alpine/default-bytecode-levels.patch

@@ -0,0 +1,16 @@
+diff --git a/gpep517/__main__.py b/gpep517/__main__.py
+index d519c75..2dc0b49 100644
+--- a/gpep517/__main__.py
++++ b/gpep517/__main__.py
+@@ -350,9 +350,9 @@ def add_install_args(parser):
+                        f"(default: {sys.executable})")
+     group.add_argument("--optimize",
+                        type=parse_optimize_arg,
+-                       default=[],
++                       default=[0],
+                        help="Comma-separated list of optimization levels "
+-                       "to compile bytecode for (default: none), pass 'all' "
++                       "to compile bytecode for (default: 0), 0s 'all' "
+                        "to enable all known optimization levels (currently: "
+                        f"{', '.join(str(x) for x in ALL_OPT_LEVELS)})")
+