polybridge_fix.c

#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <dlfcn.h>

// compile: gcc polybridge_fix.c -o polybridge_fix.so -ldl -shared -fPIC
// use: set launch command in steam to
//      LD_PRELOAD=/path/to/polybridge_fix.so %command%