Revert "Merge #107253: bintools-wrapper: fix inverted link32 check"

This reverts commit 241c3912555e0f80e3a61a808c70986f0f4cb8fe, reversing
changes made to ab8c2b2b2ca6579104f5692ead859db31030de35.

These toolchain changes are too problematic, so reverting for now; see
https://github.com/NixOS/nixpkgs/pull/107086#issuecomment-749196366

pkgs/build-support/bintools-wrapper/ld-wrapper.sh

@@ -145,7 +145,7 @@ then
     done
 fi
 
-if [[ "$link32" = "1" && "$setDynamicLinker" = 1 && -e "@out@/nix-support/dynamic-linker-m32" ]]; then
+if [[ "$link32" = "0" && "$setDynamicLinker" = 1 && -e "@out@/nix-support/dynamic-linker-m32" ]]; then
     # We have an alternate 32-bit linker and we're producing a 32-bit ELF, let's
     # use it.
     extraAfter+=(