[gn build] Port fc4661a

Author: llvmgnsyncbot

llvm/utils/gn/secondary/libcxx/include/BUILD.gn

@@ -1351,6 +1351,7 @@ if (current_toolchain == default_toolchain) {
       "__random/uniform_real_distribution.h",
       "__random/weibull_distribution.h",
       "__ranges/access.h",
+      "__ranges/adjacent_transform_view.h",
       "__ranges/adjacent_view.h",
       "__ranges/all.h",
       "__ranges/as_rvalue_view.h",