meta: move photon/libc to root

libc/stdio/ungetc.c

@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <__fio.h>
+
+int ungetc(int c, FILE *fp)
+{
+    if (c == EOF) {
+        return EOF;
+    }
+
+    int res = __fio_ungetc(fp, c);
+    return res == -1 ? EOF : c;
+}