[bazel][libc] Add more missing deps for parsing headers standalone.

Commit c192b3d missed some targets when fixing standalone header parsing
after 019a477.

Author: slackito

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

@@ -157,6 +157,7 @@ libc_support_library(
     hdrs = ["src/__support/CPP/bit.h"],
     deps = [
         ":__support_cpp_type_traits",
+        ":__support_macros_attributes",
         ":__support_macros_config",
         ":libc_root",
     ],
@@ -165,14 +166,18 @@ libc_support_library(
 libc_support_library(
     name = "__support_cpp_bitset",
     hdrs = ["src/__support/CPP/bitset.h"],
-    deps = [":libc_root"],
+    deps = [
+        ":__support_macros_attributes",
+        ":libc_root",
+    ],
 )
 
 libc_support_library(
     name = "__support_cpp_cstddef",
     hdrs = ["src/__support/CPP/cstddef.h"],
     deps = [
         ":__support_cpp_type_traits",
+        ":__support_macros_attributes",
         ":libc_root",
     ],
 )