[v9_9] accept >4g max-{,a}cache-size

[v9_9] accept >4g max-{,a}cache-size

3505.	[bug]		When setting "max-cache-size" and "max-acache-size",
			larger values than 4 gigabytes could not be set
			explicitly, though larger sizes were available
			when setting cache size to 0. This has been
			corrected; the full range is now available.
			[RT #32358]
(cherry picked from commit 2a184ff86544cc67c36e2ce6bb3ddb5ac44684b8)