pgsql: Rename walmethod fsync method to sync

Rename walmethod fsync method to sync

Using the name fsync clashed with the #define we have on Windows that
redefines it to _commit. Naming it sync should remove that conflict.

Per all the Windows buildfarm members

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/eade082b122889eaf92eb806b8b6799160a25256

Modified Files
--------------
src/bin/pg_basebackup/receivelog.c | 6 +++---
src/bin/pg_basebackup/walmethods.c | 10 +++++-----
src/bin/pg_basebackup/walmethods.h | 2 +-
3 files changed, 9 insertions(+), 9 deletions(-)

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