Apply by doing:
	cd /usr/src
	patch -p0 < 005_ldso.patch

And then rebuild and install ld.so:
	cd libexec/ld.so
	make obj
	make cleandir
	make depend
	make
	make install

Index: libexec/ld.so/loader.c
===================================================================
RCS file: /cvs/src/libexec/ld.so/loader.c,v
retrieving revision 1.103
retrieving revision 1.103.2.1
diff -u -p -r1.103 -r1.103.2.1
--- libexec/ld.so/loader.c	8 May 2006 20:37:01 -0000	1.103
+++ libexec/ld.so/loader.c	15 Nov 2006 23:04:36 -0000	1.103.2.1
@@ -850,8 +850,8 @@ _dl_unsetenv(const char *var, char **env
 			for (P = env;; ++P)
 				if (!(*P = *(P + 1)))
 					break;
-		}
-		env++;
+		} else
+			env++;
 	}
 }