android: base: Fix build adding extra -latomic

We don't use use_sysroot=true, but without it -latomic is added
to is_android.

src/base/BUILD.gn

@@ -1082,7 +1082,7 @@ component("base") {
   # Needed for <atomic> if using newer C++ library than sysroot, except if
   # building inside the cros_sdk environment - use host_toolchain as a
   # more robust check for this.
-  if (!use_sysroot && (is_android || is_chromeos || (is_linux && !is_castos)) &&
+  if (!use_sysroot && (is_chromeos || (is_linux && !is_castos)) &&
       host_toolchain != "//build/toolchain/cros:host") {
     libs += [ "atomic" ]
   }