Revert "[libc][bazel] Add copts to libc_support_library" (#73723)

Reverts #73591

Broke downstream builds. I will look into relanding tomorrow.

utils/bazel/llvm-project-overlay/libc/libc_build_rules.bzl

@@ -47,10 +47,8 @@ def _libc_library(name, hidden, copts = [], deps = [], **kwargs):
 # A convenience function which should be used to list all libc support libraries.
 # Any library which does not define a public function should be listed with
 # libc_support_library.
-def libc_support_library(name, copts = None, **kwargs):
-    copts = copts or []
-    copts = copts + ["-O3", "-fno-builtin", "-fno-lax-vector-conversions"]
-    _libc_library(name = name, copts = copts, hidden = False, **kwargs)
+def libc_support_library(name, **kwargs):
+    _libc_library(name = name, hidden = False, **kwargs)
 
 def libc_function(
         name,