message: Remove iostream from GLX backend
diff: #include <dlfcn.h>
  -#include <iostream>
  -
  #define LIBRARY_GLX "libGL.so.1"
  #define LIBRARY_X11 "libX11.so.6"
  @@ -88,7 +86,7 @@ static PFNGLXGETPROCADDRESSPROC getProcAddress;
  static bool loadLibraries() {
  g_glx.library = dlopen(LIBRARY_GLX, RTLD_LOCAL | RTLD_NOW);
  if (!g_glx.library) {
  - std::cerr << "Could not find library " << LIBRARY_GLX << std::endl;
  + utils::slog.e << "Could not find library " << LIBRARY_GLX << utils::io::endl;
  return false;
  }
  @@ -119,7 +117,7 @@ static bool loadLibraries() {
  g_x11.library = dlopen(LIBRARY_X11, RTLD_LOCAL | RTLD_NOW);
  if (!g_x11.library) {
  - std::cerr << "Could not find library " << LIBRARY_X11 << std::endl;
  + utils::slog.e << "Could not find library " << LIBRARY_X11 << utils::io::endl;
  return false;
  }
  