Fix for bug #68087 (ODBC not reading DATE columns correctly)

Temporary variable indicating column field type ID should be
reset to default for loop iteration (i.e. every column in the
record set. The old buggy code made it persist across all columns
leading to invalid reads from the buffer, if for example a DATE
column was preceded by a VARCHAR column.
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Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
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  Fix for bug #68087 (ODBC not reading DATE columns correctly)
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