Make wasi-libc.h a public header.

Author: sunfishcode

expected/wasm32-wasi/include-all.c

@@ -179,6 +179,7 @@
 #include <unistd.h>
 #include <utime.h>
 #include <values.h>
+#include <wasi-libc.h>
 #include <wasi.h>
 #include <wchar.h>
 #include <wctype.h>

libc-bottom-half/headers/private/wasi-libc.h

@@ -0,0 +1,15 @@
+#ifndef __wasilibc_wasilibc_h
+#define __wasilibc_wasilibc_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int __wasilibc_register_preopened_fd(int fd, const char *path);
+int __wasilibc_fd_renumber(int fd, int newfd);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

libc-bottom-half/headers/public/wasi-libc.h

@@ -1,5 +1,7 @@
 #ifdef __wasilibc_unmodified_upstream
 #include "stdio_impl.h"
+#else
+#include <wasi-libc.h>
 #endif
 #include <fcntl.h>
 #include <unistd.h>