Fix some optimization warnings

include/QF/input/event.h

@@ -117,6 +117,6 @@ int IE_Send_Event (const IE_event_t *event);
 int IE_Add_Handler (ie_handler_t *event_handler, void *data);
 void IE_Remove_Handler (int handle);
 void IE_Set_Focus (int handle);
-int IE_Get_Focus (void);
+int IE_Get_Focus (void) __attribute__ ((pure));
 
 #endif//__QF_in_event_h

include/QF/input/imt.h

@@ -59,7 +59,7 @@ typedef struct in_context_s {
 int IMT_GetAxisBlock (int num_axes);
 int IMT_GetButtonBlock (int num_buttons);
 int IMT_CreateContext (const char *name);
-int IMT_GetContext (void);
+int IMT_GetContext (void) __attribute__ ((pure));
 void IMT_SetContext (int ctx);
 void IMT_SetContextCbuf (int ctx, struct cbuf_s *cbuf);
 imt_t *IMT_FindIMT (const char *name);

libs/console/client.c

@@ -648,7 +648,7 @@ draw_notify (view_t *view)
 static void
 setup_console (void)
 {
-	float       lines;
+	float       lines = 0;
 
 	switch (con_state) {
 		case con_inactive:

libs/input/in_imt.c

@@ -185,7 +185,7 @@ IMT_CreateContext (const char *name)
 	return ctx - in_contexts.a;
 }
 
-static in_context_t *
+static in_context_t * __attribute__ ((pure))
 imt_find_context (const char *name)
 {
 	for (size_t i = 0; i < in_contexts.size; i++) {