Bug 1711856 - Don't set LD_LIBRARY_PATH for builds on automation. r=firefox-build-system-reviewers,mhentges

This shouldn't be necessary as of bug 1694785.

Differential Revision: https://phabricator.services.mozilla.com/D115467

build/unix/mozconfig.stdcxx

@@ -1,17 +1,2 @@
 # Avoid dependency on libstdc++ 4.7
 export MOZ_STDCXX_COMPAT=1
-
-# Depending whether GCC was built on a RedHat-based or a Debian-based system,
-# the directory containing 32-bits libraries can be either (respectively)
-# lib or lib32. The directory for 64-bits libraries is always lib64.
-if [ -f "$MOZ_FETCHES_DIR/gcc/lib64/libstdc++.so.6" ]; then
-  # We put both 32-bits and 64-bits library path in LD_LIBRARY_PATH: ld.so
-  # will prefer the files in the 32-bits path when loading 32-bits executables,
-  # and the files in the 64-bits path when loading 64-bits executables.
-  # We also put both possible 32-bits library paths.
-  LD_LIBRARY_PATH=${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$MOZ_FETCHES_DIR/gcc/lib64:$MOZ_FETCHES_DIR/gcc/lib32:$MOZ_FETCHES_DIR/gcc/lib
-elif [ -f "$MOZ_FETCHES_DIR/clang/lib/libstdc++.so.6" ]; then
-  LD_LIBRARY_PATH=${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}$MOZ_FETCHES_DIR/clang/lib:$MOZ_FETCHES_DIR/clang/lib32
-fi
-
-mk_add_options "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH"