translate-all: make have_tb_lock static

It is only used by this object, and it's not exported to any other.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

accel/tcg/translate-all.c

@@ -139,7 +139,7 @@ TCGContext tcg_ctx;
 bool parallel_cpus;
 
 /* translation block context */
-__thread int have_tb_lock;
+static __thread int have_tb_lock;
 
 static void page_table_config_init(void)
 {