pg_upgrade: Read nextMultiOffset as a 64-bit value.

Commit bd8d9c9bdfa widened MultiXactOffset to 64 bits and widened
ControlData.chkpnt_nxtmxoff accordingly, but get_control_data() still
read the "Latest checkpoint's NextMultiOffset" line with str2uint(),
which returns unsigned int.

This commit adds str2uint64(), mirroring the str2uint() helper used
for the other control file fields, and reads the offset with it.

Backpatch to v19, where MultiXactOffset was widened.

Reviewed-by: Heikki Linnakangas <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: 
https://postgr.es/m/CAD21AoCvzerscfU8o4ARQ793yAGHpQ72r2x5apeC_W2-k=s...@mail.gmail.com
Backpatch-through: 19

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/e721ce48dc78b58827c35d6a13f9f72a591e68f2

Modified Files
--------------
src/bin/pg_upgrade/controldata.c |  2 +-
src/bin/pg_upgrade/pg_upgrade.h  |  1 +
src/bin/pg_upgrade/util.c        | 11 +++++++++++
3 files changed, 13 insertions(+), 1 deletion(-)

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