FIX: Add /usr/lib32/libc.so.6 to the libc search order

Add /usr/lib32/libc.so.6 to the libc search order used by the encapped
binaries for the CALL workaround. This path is used by e.g. 64-bit Arch
Linux. It's important that this path is located _before_
/lib/libc.so.6 in the search order, as on e.g. 64-bit Arch Linux
/lib/libc.so.6 points to the 64-bit libc.