Add support for darwin_arm64 cpu in curl build file.

also remove unused config_settings from cc build file.

PiperOrigin-RevId: 425347250

cc/BUILD.bazel

@@ -671,17 +671,6 @@ cc_library(
     deps = [":key_access"],
 )
 
-# Settings for building in various environments.
-config_setting(
-    name = "linux_x86_64",
-    values = {"cpu": "k8"},
-)
-
-config_setting(
-    name = "mac_x86_64",
-    values = {"cpu": "darwin"},
-)
-
 # tests
 
 cc_test(

cc/third_party/curl.BUILD.bazel

@@ -14,6 +14,13 @@ config_setting(
     values = {"cpu": "darwin"},
 )
 
+config_setting(
+    name = "darwin_arm64",
+    values = {
+        "cpu": "darwin_arm64",
+    },
+)
+
 cc_library(
     name = "curl",
     srcs = [
@@ -216,6 +223,9 @@ cc_library(
         ":mac_x86_64": [
             "lib/vtls/darwinssl.c",
         ],
+        ":darwin_arm64": [
+            "lib/vtls/darwinssl.c",
+        ],
         ":linux_x86_64": [
             "lib/vtls/openssl.c",
         ],
@@ -245,6 +255,9 @@ cc_library(
         ":mac_x86_64": [
             "-fno-constant-cfstrings",
         ],
+        ":darwin_arm64": [
+            "-fno-constant-cfstrings",
+        ],
         ":linux_x86_64": [
             "-DCURL_MAX_WRITE_SIZE=65536",
         ],
@@ -258,6 +271,12 @@ cc_library(
             "-Wl,-framework",
             "-Wl,Security",
         ],
+        ":darwin_arm64": [
+            "-Wl,-framework",
+            "-Wl,CoreFoundation",
+            "-Wl,-framework",
+            "-Wl,Security",
+        ],
         ":linux_x86_64": [
             "-lrt",
         ],