Let GCC validate webtiles printfs.

Sadly, clang and gcc earlier than 4.7 insist that printf("") is bad, and the
option to disable that (-Wno-format-zero-length) doesn't work in C++ mode.
Thus, I had to split {write,send}_message() into two: one with an argument,
one without.

1 files changed, 4 insertions, 2 deletions

diff --git a/crawl-ref/source/tileweb.h b/crawl-ref/source/tileweb.h
index 7ec1812880..8128ea4cc0 100644
--- a/crawl-ref/source/tileweb.h
+++ b/crawl-ref/source/tileweb.h
@@ -81,9 +81,11 @@ public:
     void pop_menu();
     void close_all_menus();
 
-    void write_message(const char *format, ...);
+    void write_message();
+    void write_message(PRINTF(1, ));
     void finish_message();
-    void send_message(const char *format = "", ...);
+    void send_message();
+    void send_message(PRINTF(1, ));
 
     bool has_receivers() { return !m_dest_addrs.empty(); }
     bool is_controlled_from_web() { return m_controlled_from_web; }