Remove dangling symlink.

Bug: N/A
Test: N/A
Change-Id: I6af95827b28f47aa0cd5f1abb5dded15253f7686
diff --git a/libc/arch-mips64/include b/libc/arch-mips64/include
deleted file mode 120000
index fabbe8a..0000000
--- a/libc/arch-mips64/include
+++ /dev/null
@@ -1 +0,0 @@
-../arch-mips/include
\ No newline at end of file