Don't export the wine_pthread_* functions.

diff --git a/libs/wine/wine.def b/libs/wine/wine.def
index 97e19f0..e7725f4 100644
--- a/libs/wine/wine.def
+++ b/libs/wine/wine.def
@@ -52,8 +52,6 @@
     wine_ldt_init_locking
     wine_ldt_realloc_entries
     wine_ldt_set_entry
-    wine_pthread_init_process
-    wine_pthread_init_thread
     wine_set_fs
     wine_set_gs
     wine_switch_to_stack