Janitorial: Get rid of W->A calls for shlexec (2/2)

[Marcelo Duarte]

Changelog:
Marcelo Duarte <wine-devel at bol.com.br>
-Janitorial: Get rid of W->A calls for shlexec
-Implementation of FindExecutableW

> No, there are still many places where the sizes are wrong. Every time
> you change a buffer from char[] to WCHAR[] you have to fix uses of
> sizeof on that buffer to count characters properly. Also there are
> still HeapAlloc calls that are done in bytes instead of WCHARs.

ok.
-- 
Marcelo Duarte