InnoDB: Remove some debug variables unless UNIV_SEARCH_PERF_STAT is defined

innobase/btr/btr0sea.c:
  Remove variable btr_search_n_succ unless #ifdef UNIV_SEARCH_PERF_STAT
innobase/include/btr0sea.h:
  Remove variable btr_search_n_succ unless #ifdef UNIV_SEARCH_PERF_STAT
innobase/page/page0cur.c:
  Make page_rnd a static variable
  Remove variable page_cur_short_succ unless #ifdef UNIV_SEARCH_PERF_STAT
innobase/include/page0cur.h:
  Remove variable page_cur_short_succ unless #ifdef UNIV_SEARCH_PERF_STAT

innobase/btr/btr0sea.c

@@ -22,7 +22,9 @@ Created 2/17/1996 Heikki Tuuri
 ulint	btr_search_this_is_zero = 0;	/* A dummy variable to fool the
 					compiler */
 
+#ifdef UNIV_SEARCH_PERF_STAT
 ulint	btr_search_n_succ	= 0;
+#endif /* UNIV_SEARCH_PERF_STAT */
 ulint	btr_search_n_hash_fail	= 0;
 
 byte	btr_sea_pad1[64];	/* padding to prevent other memory update

innobase/include/btr0sea.h

@@ -214,7 +214,9 @@ extern rw_lock_t*	btr_search_latch_temp;
 
 #define btr_search_latch	(*btr_search_latch_temp)
 
+#ifdef UNIV_SEARCH_PERF_STAT
 extern ulint	btr_search_n_succ;
+#endif /* UNIV_SEARCH_PERF_STAT */
 extern ulint	btr_search_n_hash_fail;
 
 /* After change in n_fields or n_bytes in info, this many rounds are waited

innobase/include/page0cur.h

@@ -32,8 +32,11 @@ Created 10/4/1994 Heikki Tuuri
 				 which extend it */
 #define	PAGE_CUR_DBG	6
 
-
+#ifdef PAGE_CUR_ADAPT
+# ifdef UNIV_SEARCH_PERF_STAT
 extern ulint	page_cur_short_succ;
+# endif /* UNIV_SEARCH_PERF_STAT */
+#endif /* PAGE_CUR_ADAPT */
 
 /*************************************************************
 Gets pointer to the page frame where the cursor is positioned. */

innobase/page/page0cur.c

@@ -16,11 +16,12 @@ Created 10/4/1994 Heikki Tuuri
 #include "log0recv.h"
 #include "rem0cmp.h"
 
-ulint	page_cur_short_succ	= 0;
-
-ulint	page_rnd	= 976722341;
+static ulint	page_rnd	= 976722341;
 
 #ifdef PAGE_CUR_ADAPT
+# ifdef UNIV_SEARCH_PERF_STAT
+ulint	page_cur_short_succ	= 0;
+# endif /* UNIV_SEARCH_PERF_STAT */
 
 /********************************************************************
 Tries a search shortcut based on the last insert. */