icu module parallel build fix

Parallel builds of the icu module fail sporadically due to a race
condition. Tweak the makefile dependencies to hopefully fix the
problem.

(cherry picked from commit

icu module parallel build fix

Parallel builds of the icu module fail sporadically due to a race
condition. Tweak the makefile dependencies to hopefully fix the
problem.

(cherry picked from commit 17604d2661ceca2ca6d152a1fcedd0802bbab260)

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