Reordered the CALLBACK and WINAPI directives so that it compiles with
old g++ versions.

diff --git a/include/server.h b/include/server.h
index 6eb4a0f..8564b56 100644
--- a/include/server.h
+++ b/include/server.h
@@ -1319,7 +1319,7 @@
 extern const char *get_config_dir(void);
 
 /* get a pointer to the request buffer */
-static inline void * WINE_UNUSED get_req_buffer(void)
+static inline void WINE_UNUSED *get_req_buffer(void)
 {
     return NtCurrentTeb()->buffer;
 }