Torchlight II undefined symbol: FT_Done_MM_Var

**Game information**
Torchlight II

**Distribution name and version where applicable**

NAME="openSUSE Tumbleweed"
# VERSION="20200108"

**Flatpak info**
flatpak --version
Flatpak 1.6.0

flatpak --gl-drivers
default
host

**Problem description**

`/home/samantha/.local/share/Steam/steamapps/common/Torchlight II/ModLauncher.bin.x86_64: symbol lookup error: /usr/lib/x86_64-linux-gnu/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var`

**Does this issue reproduce with native Steam**
Torchlight II works fine with native steam

This is related to #95 except Torchlight II's version of libfontconfig.so.1 **is** blocked, but it is a different file which now has this issue.

output with `--env=LD_DEBUG=libs,files,bindings `
```
465: file=libfontconfig.so.1 [0]; needed by /home/samantha/.local/share/Steam/steamapps/common/Torchlight II/ModLauncher.bin.x86_64 [0]
465: find library=libfontconfig.so.1 [0]; searching
465: search path=/home/samantha/.local/share/Steam/steamapps/common/Torchlight II/lib64 (RPATH from file /home/samantha/.local/share/Steam/steamapps/common/Torchlight II/ModLauncher.bin.x86_64)
465: trying file=/home/samantha/.local/share/Steam/steamapps/common/Torchlight II/lib64/libfontconfig.so.1
Blocked library /home/samantha/.local/share/Steam/steamapps/common/Torchlight II/lib64/libfontconfig.so.1
465: search path=/home/samantha/.local/share/Steam/ubuntu12_32/steam-runtime/pinned_libs_32:/home/samantha/.local/share/Steam/ubuntu12_32/steam-runtime/pinned_libs_64:/app/lib/i386-linux-gnu/GL/default/lib:/app/lib32:/app/lib/i386-linux-gnu:/lib64:/app/lib:/usr/lib/x86_64-linux-gnu/GL/default/lib:/usr/lib/x86_64-linux-gnu/openh264/extra (LD_LIBRARY_PATH)
465: trying file=/home/samantha/.local/share/Steam/ubuntu12_32/steam-runtime/pinned_libs_32/libfontconfig.so.1
465: trying file=/home/samantha/.local/share/Steam/ubuntu12_32/steam-runtime/pinned_libs_64/libfontconfig.so.1
465: trying file=/app/lib/i386-linux-gnu/GL/default/lib/libfontconfig.so.1
465: trying file=/app/lib32/libfontconfig.so.1
465: trying file=/app/lib/i386-linux-gnu/libfontconfig.so.1
465: trying file=/lib64/libfontconfig.so.1
465: trying file=/app/lib/libfontconfig.so.1
465: trying file=/usr/lib/x86_64-linux-gnu/GL/default/lib/libfontconfig.so.1
465: trying file=/usr/lib/x86_64-linux-gnu/openh264/extra/libfontconfig.so.1
465: search path=/usr/lib/x86_64-linux-gnu (system search path)
465: trying file=/usr/lib/x86_64-linux-gnu/libfontconfig.so.1
465:
465: file=libfontconfig.so.1 [0]; generating link map
465: dynamic: 0x00007f55afb1e9e0 base: 0x00007f55afad7000 size: 0x0000000000048288
/home/samantha/.local/share/Steam/steamapps/common/Torchlight II/ModLauncher.bin.x86_64: symbol lookup error: /usr/lib/x86_64-linux-gnu/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var

```