rc: fix large numeric parameters being rejected on 32 bit builds

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Params.GetInt64 parsed string parameters with strconv.ParseInt(x, 10, 0).
A bitSize of 0 means int, which is 32 bits on 386, arm, mips and mipsle,
so any value outside the int32 range was rejected as out of range even
though it fits in the int64 the method returns.

Parameters reach the rc API as strings on the paths that matter here: the
rc server puts every URL query and form value into Params as a string, and
rclone rc turns each key=value argument into a string. So on a 32 bit build
operations/getfile could not be given an offset, count, head or tail beyond
2 GiB, and debug/set-soft-memory-limit could not be given a limit beyond
2 GiB, while the same commands worked on a 64 bit build.

Parse with a bitSize of 64 to match the declared return type. This is the
string half of the range checking that was added to the float64 branch of
the same function in 976d05e1.

(cherry picked from commit b5f83bdbf2)

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