[issue21679] Prevent extraneous fstat during open()

[Bohuslav "Slavek" Kabrda]

Bohuslav "Slavek" Kabrda added the comment:

Again, thanks for the review. It's true that HAVE_FSTAT can be defined without stat structure containing st_blksize. I added an ifdef HAVE_STRUCT_STAT_ST_BLKSIZE for that. Attaching third version of the patch, hopefully everything will be ok now.

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Added file: http://bugs.python.org/file35548/python3-remove-extraneous-fstat-on-file-open-v3.patch

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