accel/tcg: Include tcg.h in tcg-runtime.c

Code movement in an upcoming patch will show that this file
was implicitly depending on tcg.h being included indirectly.
Tested-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

accel/tcg/tcg-runtime.c

@@ -30,6 +30,7 @@
 #include "exec/tb-lookup.h"
 #include "disas/disas.h"
 #include "exec/log.h"
+#include "tcg.h"
 
 /* 32-bit helpers */