Fix glitches in recent hash table changes
* src/fns.c (Fmake_hash_table): Simplify the machine code slightly by using 0 rather than -1. * src/lisp.h (struct Lisp_Hash_Table.pure): Now bool rather than a bitfield, for speed (the bitfield did not save space). (struct Lisp_Hash_Table.rehash_threshold): Now double rather than float, since the float caused unwanted rounding errors, e.g., (hash-table-rehash-threshold (make-hash-table)) yielded 0.800000011920929 instead of the correct 0.8.
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