Remove dead code.

We haven't built any of this for years.

Test: treehugger
Change-Id: I3f8a85e9530af68587f47931d850eb60631a9481
diff --git a/libc/bionic/sys_shm.cpp b/libc/bionic/sys_shm.cpp
index f3b26e7..f780e04 100644
--- a/libc/bionic/sys_shm.cpp
+++ b/libc/bionic/sys_shm.cpp
@@ -45,9 +45,8 @@
 }
 
 int shmctl(int id, int cmd, struct shmid_ds* buf) {
-#if !defined(__LP64__) || defined(__mips__)
+#if !defined(__LP64__)
   // Annoyingly, the kernel requires this for 32-bit but rejects it for 64-bit.
-  // Mips64 is an exception to this, it requires the flag.
   cmd |= IPC_64;
 #endif
 #if defined(SYS_shmctl)