adapt to @staticfloat's changes

Author: samtkaplan

docs/src/pythoncall.md

@@ -286,10 +286,10 @@ If `conda`, `mamba` or `micromamba` is not in your `PATH` you will also need to
 `JULIA_CONDAPKG_EXE` to its path.
 
 #### If you installed a newer version of libstdc++
-On Linux, Julia comes bundled with its own copy of *libstdc++*.  Therefore, when interacting with
-CondaPkg, PythonCall injects a dependency to bound the allowed versions of the `libstdcxx-ng`
-Conda package. To override this value (e.g. if the user replaced the bundled libstdc++ with something
-newer), use:
+PythonCall injects a dependency to bound the allowed versions of the `libstdcxx-ng`
+Conda package. It finds the bound by runtime discovery of the libstdcxx version.  To
+override this value (e.g. if the user replaced the bundled libstdc++ with something
+else, use:
 
 ```julia
 [PythonCall]

test/context.jl

@@ -1,14 +1,6 @@
 @testitem "libstdc++ version" begin
-    cxxversion = PythonCall.get_libstdcxx_version_bound()
-
-    if VERSION <= v"1.6.2"
-        @test cxxversion == ">=3.4,<9.2"
-    else
-        @test cxxversion == ">=3.4,<11.4"
-    end
-
     ENV["JULIA_CONDAPKG_LIBSTDCXX_VERSION_BOUND"] = ">=3.4,<=12"
 
-    cxxversion = PythonCall.get_libstdcxx_version_bound()
-    @test cxxversion == ">3.4,<=12"
+    cxxversion = PythonCall.C.get_libstdcxx_version_bound()
+    @test cxxversion == ">=3.4,<=12"
 end