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stdio.h: correct return type of putc

The putc macro is specified as returning an int, but our
type conversion rules turned it into a uint. Put in the
appropriate cast to make the type what we want.

--- a/sys/include/ape/stdio.h

+++ b/sys/include/ape/stdio.h

@@ -106,7 +106,7 @@

 #define	getchar()	getc(stdin)

 extern char *gets(char *);

 extern int putc(int, FILE *);

-#define	putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(*(unsigned char*)(f)->wp++=(c)&_IO_CHMASK))

+#define	putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(int)(*(unsigned char*)(f)->wp++=(c)&_IO_CHMASK))

 extern int _IO_putc(int, FILE *);

 extern int putchar(int);

 #define	putchar(c)	putc(c, stdout)

--- a/sys/include/stdio.h

+++ b/sys/include/stdio.h

@@ -92,7 +92,7 @@

 #define	getchar()	getc(stdin)

 char *gets(char *);

 int putc(int, FILE *);

-#define	putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(*(unsigned char*)(f)->wp++=(c)&_IO_CHMASK))

+#define	putc(c, f) ((f)->wp>=(f)->rp?_IO_putc(c, f):(int)(*(unsigned char*)(f)->wp++=(c)&_IO_CHMASK))

 int _IO_putc(int, FILE *);

 int putchar(int);

 #define	putchar(c)	putc(c, stdout)