shdocvw: Strip out initial whitespaces and quotes around an URL on iexplore command line

[Paul Chitescu]

Changelog:
	shdocvw: Strip out initial whitespaces and quotes around an URL on iexplore 
command line

Experiments with wine's iexplore.exe and IE's shdocvw.dll showed that we must 
remove quotes and any spaces left over after stripping other options.

This makes the following command succeed in both wine and native:
wine iexplore -nohome 'file:///C:/Program Files/Common Files/test.html'

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