Used to load libtcmalloc.so downloaded from xbps package manager (void linux)

In the xbps package manager version of Steam (and on other versions such as flatpak on a variety of distributions) , many older source games don't run due to some random incompatibility that I couldn't explain to you (https://github.com/ValveSoftware/Source-1-Games/issues/5033).

The solution for this was to download gperftools, including both the regular and devel versions (both normal and 32-bit) and to add the launch command.