Backport dl_iterate_phdr from FreeBSD-7 so that we can use gcc-4
and not pull in libgcc_s.so.1 into every binary we build.

diff -ur lib/libc/gen/dlfcn.c lib/libc/gen/dlfcn.c
--- lib/libc/gen/dlfcn.c	2004-03-05 08:10:17 +0000
+++ lib/libc/gen/dlfcn.c	2007-09-10 14:11:12 +0100
@@ -31,6 +31,7 @@
  * Linkage to services provided by the dynamic linker.
  */
 #include <dlfcn.h>
+#include <link.h>
 #include <stddef.h>
 
 static const char sorry[] = "Service unavailable";
@@ -118,3 +119,14 @@
 {
 	_rtld_error(sorry);
 }
+
+#ifdef _GENTOO_DL_ITERATE_PHDR
+#pragma weak dl_iterate_phdr
+int
+dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
+    void *data)
+{
+	_rtld_error(sorry);
+	return 0;
+}
+#endif