Rename thread to _thread and dummy_thread to _dummy_thread. Issue #2875.
diff --git a/PC/os2emx/Makefile b/PC/os2emx/Makefile
index 2fcb334..5f4cab8 100644
--- a/PC/os2emx/Makefile
+++ b/PC/os2emx/Makefile
@@ -281,7 +281,7 @@
 		Modules/gcmodule.c \
 		Modules/signalmodule.c \
 		Modules/posixmodule.c \
-		Modules/threadmodule.c \
+		Modules/_threadmodule.c \
 		Modules/arraymodule.c \
 		Modules/binascii.c \
 		Modules/cmathmodule.c \