libgo: remove go-memmove.c in cmake file

CL 170004 removes the file.

Change-Id: Ie36d2376d6ac6ea2b770e6878c2a60b7de680ee3
Reviewed-on: https://go-review.googlesource.com/c/gollvm/+/176041
Reviewed-by: Than McIntosh <thanm@google.com>
diff --git a/libgo/CMakeLists.txt b/libgo/CMakeLists.txt
index aaf9b05..f4d8c74 100644
--- a/libgo/CMakeLists.txt
+++ b/libgo/CMakeLists.txt
@@ -404,7 +404,6 @@
   "runtime/go-memclr.c"
   "runtime/go-memcmp.c"
   "runtime/go-memequal.c"
-  "runtime/go-memmove.c"
   "runtime/go-nanotime.c"
   "runtime/go-now.c"
   "runtime/go-nosys.c"