Fix building without sysroot for ChromeOS device build

Explcitly link with libcups when building for ChromeOS device.
cups-config is currently used from debian sysroot which does not
makes sense for ChromeOS device builds.

Without it, Chrome fails to build for ChromeOS device target.

Bug: b:265165506
Change-Id: I75a64823c4d4d13161c3215218ffd76dcc7496bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4157994
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1096510}

printing/BUILD.gn

@@ -4,6 +4,7 @@
 
 import("//build/config/chromeos/ui_mode.gni")
 import("//build/config/features.gni")
+import("//build/config/linux/pkg_config.gni")
 import("//build/config/sysroot.gni")
 import("//build/config/ui.gni")
 import("//pdf/features.gni")
@@ -426,6 +427,11 @@ test("printing_unittests") {
 }
 
 if (use_cups) {
+  if (is_chromeos_device) {
+    pkg_config("cups") {
+      packages = [ "cups" ]
+    }
+  } else {
     config("cups") {
       if (is_mac) {
         libs = [ "cups" ]
@@ -445,6 +451,7 @@ if (use_cups) {
                            "value")
       }
     }
+  }
 }
 
 if (is_android) {