stdio: declare stdin, stdout and stderr on all targets

This is needed for some basic stuff like assert.

include/stdio.h

@@ -2,8 +2,16 @@
 # define __STDIO_H__
 
 #include <stddef.h>
-#include <stdint.h>
 #include <stdarg.h>
+#include <bits/types/FILE.h>
+
+extern FILE *stdin;
+extern FILE *stdout;
+extern FILE *stderr;
+/* Make them macros (7.19.1§3) */
+#define stdin stdin
+#define stdout stdout
+#define stderr stderr
 
 /* *printf() familly - formatted output conversion. */
 extern int printf(const char *restrict format, ...);

include/target/casiowin-cg/bits/types/FILE.h

@@ -0,0 +1,7 @@
+#ifndef __BITS_TYPES_FILE_H__
+# define __BITS_TYPES_FILE_H__
+
+typedef struct {
+} FILE;
+
+#endif /*__BITS_TYPES_FILE_H__*/

include/target/casiowin-fx/bits/types/FILE.h

@@ -0,0 +1,7 @@
+#ifndef __BITS_TYPES_FILE_H__
+# define __BITS_TYPES_FILE_H__
+
+typedef struct {
+} FILE;
+
+#endif /*__BITS_TYPES_FILE_H__*/

include/target/gint/bits/types/FILE.h

@@ -0,0 +1,7 @@
+#ifndef __BITS_TYPES_FILE_H__
+# define __BITS_TYPES_FILE_H__
+
+typedef struct {
+} FILE;
+
+#endif /*__BITS_TYPES_FILE_H__*/