[debug] add SYSTEM_VERSION_COMPAT=1 envvar

pyproject.toml

diff --git a/pyproject.toml b/pyproject.toml
index 2c0e0b2..18dff46 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -166,6 +166,7 @@
 # CPython 3.11 wheels aren't available for aiohttp and building a Cython extension
 # from source also doesn't work.
 AIOHTTP_NO_EXTENSIONS = "1"
+SYSTEM_VERSION_COMPAT = "1"
 
 [tool.cibuildwheel.linux]
 before-build = [