[PATCH v2 0/2] MR1268: wininet: Implement InternetSetFilePointer

[Jason Kuo (＠j20001970)]

The function is implemented by setting cache file pointer to fill
read_buf. Consequently, when HTTPREQ_ReadFile is called, it will try
reading data from cache after read_buf is depleted, before continuing
reading from http stream.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=26570

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  v2: wininet: Implement InternetSetFilePointer
      wininet/tests: Add InternetSetFilePointer tests.

https://gitlab.winehq.org/wine/wine/-/merge_requests/1268