stlviewer shows a 3d representation of stl files

Closes #19196.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
gpg-agent 2.0.21
gnupg2 2.0.21
Always pass -headerpad_max_install_names to the linker
Use -Wl,-headerpad_max_install_names in stdenv