[llvm] [libc][bazel] Added wchar functions to bazel (PR #146126)

[Michael Jones via llvm-commits]

================
@@ -323,6 +354,11 @@ libc_support_library(
     deps = [":hdr_stdlib_overlay"],
 )
 
+libc_support_library(
+    name = "types_mbstate_t",
+    hdrs = ["hdr/types/mbstate_t.h"],
+)
+
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michaelrj-google wrote:

this isn't used right now, and it won't work if someone tries, so it should be removed.

https://github.com/llvm/llvm-project/pull/146126