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[cc1] Remove old bits from anciant times

Once upon a time when it was a requirement to be able to run this compiler
in a z80 system, and some types were used to allow an eficient program
for that architecture.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -438,7 +438,7 @@

 /* expr.c */

 extern Node *decay(Node *), *negate(Node *np), *assign(void);

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

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

 extern Node *constexpr(void), *condexpr(int neg), *expr(void);

 extern int isnodecmp(int op);

 extern int negop(int op);

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -237,7 +237,7 @@

 }

 Node *

-convert(Node *np, Type *newtp, char iscast)

+convert(Node *np, Type *newtp, int iscast)

 {

 	Type *oldtp = np->type;