dlopen() is in libc

Index: testing/cffi1/test_re_python.py
--- testing/cffi1/test_re_python.py.orig
+++ testing/cffi1/test_re_python.py
@@ -292,7 +292,7 @@ def test_dlopen_handle():
     ffi1 = FFI()
     ffi1.cdef("""void *dlopen(const char *filename, int flags);
                  int dlclose(void *handle);""")
-    lib1 = ffi1.dlopen('dl')
+    lib1 = ffi1.dlopen('c')
     handle = lib1.dlopen(extmod.encode(sys.getfilesystemencoding()),
                          _cffi_backend.RTLD_LAZY)
     assert ffi1.typeof(handle) == ffi1.typeof("void *")
