Fix incorrect config applied on macos.

Test: bazel build @com_github_cares//:ares
Bug: 274512969
Change-Id: Iba37825a725ea6fcc3ffd8372a0c0f878b39003d
diff --git a/BUILD b/BUILD
index cc80f51..5e33045 100644
--- a/BUILD
+++ b/BUILD
@@ -9,7 +9,7 @@
     ]) + select({
         "@platforms//os:linux": ["include/config_linux/ares_config.h"],
         "@platforms//os:windows": ["include/config_windows/ares_config.h"],
-        "@platforms//os:macos": ["include/config_windows/ares_config.h"],
+        "@platforms//os:macos": ["include/config_darwin/ares_config.h"],
     }),
     defines = [
         "CARES_STATICLIB",
@@ -27,7 +27,7 @@
     ] + select({
         "@platforms//os:linux": ["include/config_linux"],
         "@platforms//os:windows": ["include/config_windows"],
-        "@platforms//os:macos": ["include/config_windows"],
+        "@platforms//os:macos": ["include/config_darwin"],
     }),
     linkopts = select({
         "@platforms//os:windows": ["-defaultlib:ws2_32.lib"],