crash in cpl_vsil_win32.cpp when compiling as x64 under Windows

[swilc0x]

There is a bug in char VSIWin32FilesystemHandler::ReadDir( const char *pszPath ) that manifests as a crash under Windows when compiled as a 64bit target. There is no problem when compiled as a 32bit binary. The issue itself is that the variable 'hFile' is incorrectly declared as a long. 'hFile' should be declared as a intptr_t per the standard. This breaks on Windows when compiled as a 64bit binary because a long is 32bit whereas intptr_t is 64bit. The fix is trivial. Simply change:

long hFile;

to

intptr_t hFile;

[warmerdam]

I confirmed the handle type of _findfirst with MSDN.

The change has been applied in trunk (r17269), 1.6 branch (r17270) and 1.5 branch (r17271).

[warmerdam]

added Tamas as a cc as he is likely to be interested.