gdi32: more specific error messages in osmesa opengl initialization

[Matěj Laitl]

Hi,
please consider applying below patch that enhances debug messages from osmesa 
opengl initialization by printing also message got from wine_dlsym(). (tested 
on top of 1.5.31, the file hasn't changed in master since)

Had this patch be already there, I'd save an hour debugging why wine doesn't 
see glAccum in my /usr/lib/libOSMesa.so.8 only to find out it actually 
(correctly) loads /usr/lib32/libOSMesa.so.8.

Please CC me in replies.

Regards,
	Matěj Laitl
---
 dlls/gdi32/dibdrv/opengl.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
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