[libc][Obvious] Remove DEPS for unistd.h in CMake file of memmove.

GitOrigin-RevId: 83bd24220206765b1855514e3435c52ae8be8706
diff --git a/src/string/CMakeLists.txt b/src/string/CMakeLists.txt
index e40eeb1..19eab39 100644
--- a/src/string/CMakeLists.txt
+++ b/src/string/CMakeLists.txt
@@ -73,7 +73,6 @@
   HDRS
     memmove.h
   DEPENDS
-    libc.include.unistd
     libc.src.stdlib.abs_utils
     libc.src.string.memcpy
 )