shell32: fix program search in ShellExecuteEx, quote program name if it contains spaces

[Stefan Leichter]

This patch fixes bug 19666
The directory with the installer contains the installer itself  
named "Foxit Reader Setup.exe" and the program to be installed named "Foxit 
Reader.exe". 

ShellExecuteEx passed the filename "Foxit Reader Setup.exe" without quotes to 
CreateProcess which always picked "Foxit 
Reader.exe". Therefore the install failed.

The tests passes one Win2k and WinXP
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