pgsql: Fix error in documentated use of mingw-w64 compilers

Fix error in documentated use of mingw-w64 compilers

Error reported by Igal Sapir.

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/a16763d892b8c145ec99bba3e61fd81a27a581df

Modified Files
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doc/src/sgml/installation.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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