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stdio: fix warnings, make code more standard

Masking with _IO_CHMASK after the assignment causes a warning.
We're better off masking before, but casting the assignment to
prevent sign extension.

--- 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):((*(f)->wp++=(c))&_IO_CHMASK))

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

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

 int _IO_putc(int, FILE *);

 int putchar(int);

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

-- 

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