[PATCH] drop dlsym use for rb_stderr

[Eric Wong <e@80x24.org>]

A weak symbol works fine, here.
---
 ext/mwrap/mwrap.c      | 3 ++-
 ext/mwrap/mwrap_core.h | 1 -
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ext/mwrap/mwrap.c b/ext/mwrap/mwrap.c
index d88fee6..a45bb38 100644
--- a/ext/mwrap/mwrap.c
+++ b/ext/mwrap/mwrap.c
@@ -6,6 +6,7 @@
 #include "mwrap_core.h"
 
 static ID id_uminus;
+extern VALUE __attribute__((weak)) rb_stderr;
 extern VALUE __attribute__((weak)) rb_cObject;
 extern VALUE __attribute__((weak)) rb_eTypeError;
 extern VALUE __attribute__((weak)) rb_yield(VALUE);
@@ -33,7 +34,7 @@ static VALUE mwrap_dump(int argc, VALUE *argv, VALUE mod)
 
 	if (NIL_P(io))
 		/* library may be linked w/o Ruby */
-		io = *((VALUE *)dlsym(RTLD_DEFAULT, "rb_stderr"));
+		io = rb_stderr;
 
 	a.min = NIL_P(min) ? 0 : NUM2SIZET(min);
 	io = rb_io_get_io(io);
diff --git a/ext/mwrap/mwrap_core.h b/ext/mwrap/mwrap_core.h
index c0eea2f..721e5d3 100644
--- a/ext/mwrap/mwrap_core.h
+++ b/ext/mwrap/mwrap_core.h
@@ -26,7 +26,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <dlfcn.h>
 #include <assert.h>
 #include <errno.h>
 #include <sys/types.h>