lib/pyexec: Move header pyexec.h from stmhal directory.
diff --git a/esp8266/main.c b/esp8266/main.c
index 0d8b372..178ad8b 100644
--- a/esp8266/main.c
+++ b/esp8266/main.c
@@ -35,7 +35,7 @@
 #include "py/frozenmod.h"
 #include "py/mphal.h"
 #include "py/gc.h"
-#include "pyexec.h"
+#include "lib/utils/pyexec.h"
 #include "gccollect.h"
 #include "user_interface.h"