Win32: Fix typo on compilation speedup macro define

There is a typo:

Change from #define WIN32_MEAN_AND_LEAN to #define WIN32_LEAN_AND_MEAN.

With this change compilation fails because of missing API declaration for ExtractIconExW(). For this, also include <shellapi.h>.

Not much useful but given that it's already there let's just get it right and fix the typo :)

Tested compiling locally with both MINGW headers and official Windows SDK headers.