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Build fix: take declarations out of for loops.

The NestedVM build is still unhappy with this C99ism, unfortunately.

--- a/midend.c

+++ b/midend.c

@@ -386,10 +386,11 @@

 static char *encode_params(midend *me, const game_params *params, bool full)

 {

     char *encoded = me->ourgame->encode_params(params, full);

+    int i;

     /* Assert that the params consist of printable ASCII containing

      * neither '#' nor ':'. */

-    for (int i = 0; encoded[i]; i++)

+    for (i = 0; encoded[i]; i++)

         assert(encoded[i] >= 32 && encoded[i] < 127 &&

 	       encoded[i] != '#' && encoded[i] != ':');

     return encoded;

@@ -399,7 +400,8 @@

 {

     /* Assert that s is entirely printable ASCII, and hence safe for

      * writing in a save file. */

-    for (int i = 0; s[i]; i++)

+    int i;

+    for (i = 0; s[i]; i++)

         assert(s[i] >= 32 && s[i] < 127);

 }