Remove dead code.

We haven't built any of this for years.

Test: treehugger
Change-Id: I3f8a85e9530af68587f47931d850eb60631a9481
diff --git a/libc/libstdc++.map.txt b/libc/libstdc++.map.txt
index 0a242d5..bb7040f 100644
--- a/libc/libstdc++.map.txt
+++ b/libc/libstdc++.map.txt
@@ -5,14 +5,14 @@
     _ZdaPvRKSt9nothrow_t; # weak
     _ZdlPv; # weak
     _ZdlPvRKSt9nothrow_t; # weak
-    _Znaj; # arm x86 mips weak
-    _ZnajRKSt9nothrow_t; # arm x86 mips weak
-    _Znam; # arm64 x86_64 mips64 weak
-    _ZnamRKSt9nothrow_t; # arm64 x86_64 mips64 weak
-    _Znwj; # arm x86 mips weak
-    _ZnwjRKSt9nothrow_t; # arm x86 mips weak
-    _Znwm; # arm64 x86_64 mips64 weak
-    _ZnwmRKSt9nothrow_t; # arm64 x86_64 mips64 weak
+    _Znaj; # arm x86 weak
+    _ZnajRKSt9nothrow_t; # arm x86 weak
+    _Znam; # arm64 x86_64 weak
+    _ZnamRKSt9nothrow_t; # arm64 x86_64 weak
+    _Znwj; # arm x86 weak
+    _ZnwjRKSt9nothrow_t; # arm x86 weak
+    _Znwm; # arm64 x86_64 weak
+    _ZnwmRKSt9nothrow_t; # arm64 x86_64 weak
     __cxa_guard_abort;
     __cxa_guard_acquire;
     __cxa_guard_release;