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_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/555bc8b374f0883b51b937749e39ef8569bfd0d8

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

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