Update the minimum macos deployment version to 10.14

Bug: 191879468
Test: Build aosp-build-tools on Mac
Change-Id: I21c3d0482ba9a23b2b54849eccb18c7958559d93
diff --git a/cc/config/darwin_host.go b/cc/config/darwin_host.go
index 2cabdc8..b789590 100644
--- a/cc/config/darwin_host.go
+++ b/cc/config/darwin_host.go
@@ -79,7 +79,7 @@
 	pctx.VariableFunc("macSdkRoot", func(ctx android.PackageVarContext) string {
 		return getMacTools(ctx).sdkRoot
 	})
-	pctx.StaticVariable("macMinVersion", "10.13")
+	pctx.StaticVariable("macMinVersion", "10.14")
 	pctx.VariableFunc("MacArPath", func(ctx android.PackageVarContext) string {
 		return getMacTools(ctx).arPath
 	})