[libc][NFC][Obvious] Add a missing dep.

GitOrigin-RevId: ffb254978cf4e7a9cdbb4cbb51bfc589072353c1
diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
index 4c52a76..d11dd46 100644
--- a/include/CMakeLists.txt
+++ b/include/CMakeLists.txt
@@ -119,6 +119,7 @@
   DEF_FILE unistd.h.def
   GEN_HDR unistd.h
   DEPENDS
+    .libc_posix_types
     .llvm_libc_common_h
 )