Crash on winecheck.exe
reproduce command: 

```
FEXLoader  ./wine-1.6/bin/wine ~/Downloads/ogl/winecheck.exe

fixme:winediag:start_process Wine Staging 1.9.7 is a testing version containing experimental patches.
fixme:winediag:start_process Please mention your exact version when filing bug reports on winehq.org.
Checking OpenGL ...
OpenGL Vendor: X.Org
OpenGL Renderer: AMD OLAND (DRM 2.50.0 / 5.15.0, LLVM 6.0.0)
OpenGL Direct Rendering: True
OpenGL: PASSED

Checking fonts ...
Found Arial in wine\fonts\Arial.ttf
Found Arial in wine\fonts\Arial_Bold.ttf
Found Arial in wine\fonts\Arial_Bold_Italic.ttf
Found Arial in wine\fonts\Arial_Italic.ttf
Found Verdana in wine\fonts\Verdana.ttf
Found Verdana in wine\fonts\Verdana_Bold.ttf
Found Verdana in wine\fonts\Verdana_Bold_Italic.ttf
Found Verdana in wine\fonts\Verdana_Italic.ttf
Fonts: PASSED

Checking ACLs / XATTR ...
ACLs: PASSED
Segmentation fault (core dumped)
```

winecheck.exe source code:

https://github.com/keithbowes/pipelight/blob/40dbef17afd4d559f7e923e4970c2468fd30c83b/src/windows/winecheck/check.c

Desc:
it seems if winecheck invoke checkOpenGL function ,then wine will crash on random point near main function exit. and crash chance is not 100%, below 50%.

https://github.com/keithbowes/pipelight/blob/40dbef17afd4d559f7e923e4970c2468fd30c83b/src/windows/winecheck/check.c#L509

```
crash stack：
Process 12348 stopped
* thread #3, name = 'radeon_cs:0', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
    frame #0: 0x0000000000000000
error: memory read failed for 0x0
  thread #6, name = 'si_shader:2', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
    frame #0: 0x0000000000000000
error: memory read failed for 0x0
  thread #8, name = 'si_shader_low:1', stop reason = signal SIGSEGV: address access protected (fault address: 0x2f5cfd800)
    frame #0: 0x0000ffffa5832060 libc.so.6`__GI___pthread_mutex_unlock_usercnt at pthread_mutex_unlock.c:40:30
(lldb) bt
* thread #3, name = 'radeon_cs:0', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  * frame #0: 0x0000000000000000
(lldb) bt
* thread #3, name = 'radeon_cs:0', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  * frame #0: 0x0000000000000000
(lldb) thread list
Process 12348 stopped
  thread #1: tid = 12348, 0x0000ffffa5887910 libc.so.6`__libc_open64(file="/home/bogus/.fex-emu/Telemetry/winecheck.exe.telem.1", oflag=<unavailable>) at open64.c:41:10, name = 'winecheck.exe'
* thread #3: tid = 12473, 0x0000000000000000, name = 'radeon_cs:0', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  thread #6: tid = 12476, 0x0000000000000000, name = 'si_shader:2', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  thread #8: tid = 12478, 0x0000ffffa5832060 libc.so.6`__GI___pthread_mutex_unlock_usercnt at pthread_mutex_unlock.c:40:30, name = 'si_shader_low:1', stop reason = signal SIGSEGV: address access protected (fault address: 0x2f5cfd800)
(lldb) t 6
* thread #6, name = 'si_shader:2', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
    frame #0: 0x0000000000000000
error: memory read failed for 0x0
(lldb) bt
* thread #6, name = 'si_shader:2', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  * frame #0: 0x0000000000000000
(lldb) 
```

I add debug info in RADEON_Handler, but near the main exit point, it not invoke RADEON_Handler. 

One thread show it's name is radeon_cs, it's a ioctl cmd
```
struct drm_radeon_cs {
	__u32		num_chunks;
	__u32		cs_id;
	/* this points to __u64 * which point to cs chunks */
	__u64		chunks;
	/* updates to the limits after this CS ioctl */
	__u64		gart_limit;
	__u64		vram_limit;
};
```
I think the crash relation with openGL. But I don't know how to analysis this problem.