[physfs] Fix PhysFS_Init() Fails On Windows and Does Not Set An Error Code

[Bruno Carvalho]

To fix http://icculus.org/pipermail/physfs/2018-September/001271.html

Need change on
https://hg.icculus.org/icculus/physfs/file/tip/src/physfs_platform_windows.c#l568

DWORD psize = 0;

to

DWORD psize = 1;


Microsoft GetUserProfileDirectoryW in last update reject 0 as value
and return "invalid param", if change to 1 the function will work.
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