NLS: Use msgmerge --previous option

It provides some additional help to translators.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/fdb67eb2b69fe035339c7461c6323dc69010db18

Modified Files
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src/nls-global.mk |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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