[libc][bazel] fix missing iterator inclusion (#85840)

Patch #85702 added a new iterator header for array to use, but didn't
add it as a dependency in the bazel build. This patch fixes the issue.

Author: michaelrj-google

utils/bazel/llvm-project-overlay/libc/BUILD.bazel

@@ -161,10 +161,20 @@ libc_support_library(
     ],
 )
 
+libc_support_library(
+    name = "__support_cpp_iterator",
+    hdrs = ["src/__support/CPP/iterator.h"],
+    deps = [
+        ":__support_cpp_type_traits",
+        ":__support_macros_attributes",
+    ],
+)
+
 libc_support_library(
     name = "__support_cpp_array",
     hdrs = ["src/__support/CPP/array.h"],
     deps = [
+        ":__support_cpp_iterator",
         ":__support_macros_attributes",
     ],
 )