compat/os2threads: define INCL_DOSERRORS

This is needed to pull in the define for ERROR_TIMEOUT
Signed-off-by: Dave Yeo <daveryeo@telus.net>
Signed-off-by: Marton Balint <cus@passwd.hu>

compat/os2threads.h

@@ -27,6 +27,7 @@
 #define COMPAT_OS2THREADS_H
 
 #define INCL_DOS
+#define INCL_DOSERRORS
 #include <os2.h>
 
 #undef __STRICT_ANSI__          /* for _beginthread() */