[fusl] Update fusl

fusl/src/ldso/__dlsym.c

Index: fusl/src/ldso/__dlsym.c
diff --git a/fusl/src/ldso/__dlsym.c b/fusl/src/ldso/__dlsym.c
new file mode 100644
index 0000000000000000000000000000000000000000..99aafdf91b95c3d5a513b73f5fb66b764821366f
--- /dev/null
+++ b/fusl/src/ldso/__dlsym.c
@@ -0,0 +1,13 @@
+#include <dlfcn.h>
+#include "libc.h"
+
+__attribute__((__visibility__("hidden")))
+void __dl_seterr(const char *, ...);
+
+static void *stub_dlsym(void *restrict p, const char *restrict s, void *restrict ra)
+{
+	__dl_seterr("Symbol not found: %s", s);
+	return 0;
+}
+
+weak_alias(stub_dlsym, __dlsym);