* Implement CreatePreallocatedFile() which uses NtCreateFile() to create files with preallocated sizes.
This is used during ISO extraction to improve performance.
* Remove now-unused preallocate_filesize which was called after CreateFileU().
* Closes#1445
* NtWow64QueryInformationProcess64() fails because sizeof(PVOID64) happens to be 4 instead of 8 in MinGW32 (WTF?!?) and
therefore sizeof(pbi) is set to 44 instead of 48, resulting in NTSTATUS code 0xC0000004: STATUS_INFO_LENGTH_MISMATCH...
=> Use an ULONGLONG instead and don't rely on MinGW32's improper definitions.
* Also fix an issue whereas, when we find multiple conflicting processes, the first one's path is duplicated to all others...
* As suggested in #773
* Don't switch to using this method though, as it requires a handle to the disk or volume
to be obtained, and we use the process search in case there is an issue doing so.
