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Remove external declarations in stmt.c

It is better to have them in cc1.h, so the correctness can be
tested in all the modules.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -330,8 +330,9 @@

 extern Node *usimplify(unsigned char op, Type *tp, Node *np);

 /* expr.c */

-extern Node *expr(void), *negate(Node *np), *constexpr(void),

-            *iconstexpr(void);

+extern Node *expr(void), *negate(Node *np), *constexpr(void);

+extern Node *convert(Node *np, Type *tp1, char iscast);

+extern Node *iszero(Node *np), *eval(Node *np), *iconstexpr(void);

 /* cpp.c */

 extern void icpp(void);

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -9,8 +9,6 @@

 Symbol *curfun;

-extern Node *convert(Node *np, Type *tp1, char iscast);

-extern Node *iszero(Node *np), *eval(Node *np);

 static void stmt(Symbol *lbreak, Symbol *lcont, Caselist *lswitch);

 static void