Witcher 2 issues

[mikesart]

1. During capture: (vogltrace) Warning: GL error GL_INVALID_ENUM occurred sometime before this function was called. This error has been latched by the tracer onto the tracer's context shadow struct. This error will be reported to the caller the next time glGetError() is called, and will mask any GL error returned by that future call.
2. Libunwind crashes. Need to specify --vogl_backtrace_no_calls.
3. Fails with xterm. Need to specify --no-xterm w/ steamlauncher.
4. Several GL_INVALID_OPERATION warnings during replay.
5. Assert during replay: ../../../vogl/src/voglcommon/vogl_gl_replayer.h(548): Assertion failed: "hash_map.search_table_for_value_get_count(handle) <= 1"