Move powersOf10 to spi-flash.

app/libc/c_stdlib.c

@@ -3,6 +3,7 @@
 #include "c_types.h"
 #include "c_string.h"
 #include "user_interface.h"
+#include "user_config.h"
 
 // const char *lua_init_value = "print(\"Hello world\")";
 const char *lua_init_value = "@init.lua";
@@ -57,7 +58,7 @@ const char *c_getenv(const char *__string)
 #include <string.h>
 //#include "mprec.h"
 
-double powersOf10[] =   /* Table giving binary powers of 10.  Entry */
+double powersOf10[] ICACHE_STORE_ATTR ICACHE_RODATA_ATTR =   /* Table giving binary powers of 10.  Entry */
 {
     10.,            /* is 10^2^i.  Used to convert decimal */
     100.,           /* exponents into floating-point numbers. */