Add more targets to GN check.

build/config/linux/BUILD.gn

Index: build/config/linux/BUILD.gn
diff --git a/build/config/linux/BUILD.gn b/build/config/linux/BUILD.gn
index 0453c848d9c5f105d7ac7522030697159c880c50..202fd731897a89f29addd715f1c1150b751dde3c 100644
--- a/build/config/linux/BUILD.gn
+++ b/build/config/linux/BUILD.gn
@@ -180,15 +180,17 @@ pkg_config("gio_config") {
   #ignore_libs = true  # Loader generated below.
 }
 
-# This generates a target named "gio".
-generate_library_loader("gio") {
-  name = "LibGioLoader"
-  output_h = "libgio.h"
-  output_cc = "libgio_loader.cc"
-  header = "<gio/gio.h>"
-  config = ":gio_config"
-
-  functions = gypi_values.libgio_functions
+if (is_desktop_linux) {
+  # This generates a target named "gio".
+  generate_library_loader("gio") {
+    name = "LibGioLoader"
+    output_h = "libgio.h"
+    output_cc = "libgio_loader.cc"
+    header = "<gio/gio.h>"
+    config = ":gio_config"
+
+    functions = gypi_values.libgio_functions
+  }
 }
 
 # This generates a target named "libpci".