adapt #13379 patch for 68esr
In https://bugzilla.mozilla.org/show_bug.cgi?id=1434033, Mozilla removed the use of LD_LIBRARY_PATH (which is used in non-macOS and non-Windows Firefox to ensure that the updater can locate NSS related shared libraries). Instead, the Firefox build now adds -rpath=$ORIGIN in LDFLAGS.
For Tor Browser, we need a similar solution for Windows and macOS because we define MAR_NSS on all platforms (we define MAR_NSS so that we use NSS for MAR-related crypto on all platforms rather than relying on OS-provided libraries). Therefore, we will need to adapt our #13379 (moved) patch to account for Mozilla's change.
Current (Tor Browser 8.5a9) patch: https://gitweb.torproject.org/tor-browser.git/commit/?h=tor-browser-60.6.0esr-8.5-1&id=c17b8a3fbcd19230706f295a00ce955c1bcf90b9
Related Firefox bugs: https://bugzilla.mozilla.org/show_bug.cgi?id=1434033 https://bugzilla.mozilla.org/show_bug.cgi?id=1434666