fix timemodule.c for Win64

[bdaf8532-ded6-4d4c-9bb3-51fd76040dc1]

BPO	400512
Nosy	@tim-one, @freddrake
Files	None: None

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = 'https://github.com/freddrake' closed_at = created_at = labels = [] title = 'fix timemodule.c for Win64' updated_at = user = 'https://bugs.python.org/tmick' ``` bugs.python.org fields: ```python activity = actor = 'tim.peters' assignee = 'fdrake' closed = True closed_date = None closer = None components = ['None'] creation = creator = 'tmick' dependencies = [] files = ['2443'] hgrepos = [] issue_num = 400512 keywords = ['patch'] message_count = 4.0 messages = ['32726', '32727', '32728', '32729'] nosy_count = 3.0 nosy_names = ['tim.peters', 'fdrake', 'tmick'] pr_nums = [] priority = 'normal' resolution = None stage = None status = 'closed' superseder = None type = None url = 'https://bugs.python.org/issue400512' versions = [] ```

[bdaf8532-ded6-4d4c-9bb3-51fd76040dc1]

[tim-one]

Accepted & assigned back to Trent. I sure hope MS supports a similar performance counter under Itanium soon! time.clock under WinTel32 is one of Python's great Windows joys.

[bdaf8532-ded6-4d4c-9bb3-51fd76040dc1]

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[bdaf8532-ded6-4d4c-9bb3-51fd76040dc1]

Mark Hammond provided (a long time ago) a better Win32 specific time_clock implementation in timemodule.c. The library for this implementation does not exist on Win64 (yet, at least). This patch makes Win64 fall back on the system's clock() function for time_clock().