Spotted by Chris Ahrendt.

shell32: Make the tests of the value returned from function SHGetFileInfoA more strick, fix wine to pass the tests.

Many games set the LARGE_ADDRESS_AWARE flag but don't pass the
appropriate flags to d3dx9 to make it cope with it.

Anisotropy and texture filters are orthogonal in GL. In D3D
D3DTEXF_ANISOTROPIC just selects the best (linear) filter type and enables
anisotropy.

This is already initialized to an appropriate value in basetexture_init().
Also fix the indentation while we're at it.

Also makes the code only load the libgsm library only when it is used
instead of on initialization of the dll.