Don't find absolute path from /proc/self/exe
Similar to #20283 (moved), Mozilla cleaned up their 13+ year old code for finding the install directory path in . Instead of relying on argv, they now follow
/proc/self/exe on Linux systems (they changed how they handle this on other platforms, too).
I'm not sure if we should revert part of the patch.
commit 4fe745918004db0e36e737f945901650be10c1de Author: Mike Hommey <firstname.lastname@example.org> Date: Thu Sep 28 10:37:27 2017 +0900 Bug 1403366 - Stop requiring argv for XRE_GetBinaryPath and the underlying BinaryPath::Get. r=froydnj --HG-- extra : rebase_source : ac7bb0d7766fce5b6325c34c2868b26eec594e18