Fix map loading on OS X.
@DanielGibson pointed out that _SC_PAGESIZE itself is too big, _SC_PAGESIZE - 1 is correct. Also apply a small performance optimization by querying _SC_PAGESIZE only once.
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@ -99,7 +99,8 @@ Hunk_End(void)
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n = (byte *)mremap(membase, maxhunksize, curhunksize + sizeof(size_t), 0);
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#else
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#ifndef round_page
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#define round_page(x) ((((size_t)(x)) + sysconf(_SC_PAGESIZE)) & ~(_SC_PAGESIZE))
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size_t page_size = sysconf(_SC_PAGESIZE);
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#define round_page(x) ((((size_t)(x)) + page_size-1) & ~(page_size-1))
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#endif
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size_t old_size = round_page(maxhunksize);
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