gdi32: StartDocA support for legacy apps with incomplete DOCINFOA parameter.

[Daniel Mario Vega]

StartDocA should support legacy code that incorrectly fills DOCINFOA 
parameter. (Verified against Windows XP)

DOCINFO structure used to be shorter in Win 3.1 days. Some legacy apps ported 
to Win32 does not init/clear the fields "lpszDatatype" and  "fwType" 
correctly. We should verify these fields values before using them.

Sample legacy code here:
http://www.ddj.com/184409113?pgno=10

---
 dlls/gdi32/printdrv.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
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