dlopen() is in libc

Index: testing/cffi0/test_ownlib.py
--- testing/cffi0/test_ownlib.py.orig
+++ testing/cffi0/test_ownlib.py
@@ -397,7 +397,7 @@ class TestOwnLib:
         ffi1 = FFI(backend=backend)
         ffi1.cdef("""void *dlopen(const char *filename, int flags);
                      int dlclose(void *handle);""")
-        lib1 = ffi1.dlopen('dl')
+        lib1 = ffi1.dlopen('c')
         handle = lib1.dlopen(self.module.encode(sys.getfilesystemencoding()),
                              backend.RTLD_LAZY)
         assert ffi1.typeof(handle) == ffi1.typeof("void *")
