Add epoll and do more release readiness changes

This change also pays off some of the remaining technical debt with
stdio, file descriptors, and memory managemnt polyfills.

libc/stdio/fputwc.c

@@ -17,11 +17,9 @@
 │ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
 │ 02110-1301 USA                                                               │
 ╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/limits.h"
 #include "libc/stdio/internal.h"
 #include "libc/stdio/stdio.h"
-#include "libc/str/str.h"
-#include "libc/str/tpencode.internal.h"
+#include "libc/str/tpenc.h"
 
 /**
  * Writes wide character to stream.
@@ -29,15 +27,18 @@
  * @return wc if written or -1 w/ errno
  */
 wint_t fputwc(wchar_t wc, FILE *f) {
-  unsigned i, len;
-  char buf[MB_LEN_MAX];
+  uint64_t w;
   if (wc != -1) {
-    len = tpencode(buf, sizeof(buf), wc, false);
-    for (i = 0; i < len; ++i) {
-      if (fputc(buf[i], f) == -1) return -1;
-    }
+    w = tpenc(wc);
+    do {
+      if (fputc(w & 0xff, f) != -1) {
+        w >>= 8;
+      } else {
+        return -1;
+      }
+    } while (w);
     return wc;
   } else {
-    return fseteof(f);
+    return __fseteof(f);
   }
 }