Check std::remove return value.
Check std::remove return value.

Fix Coverity issue: Unchecked return value from library (CHECKED_RETURN).

nanodbc/nanodbc,nanodbc/nanodbc,mcg1969/nanodbc,mcg1969/nanodbc,norsync/nanodbc,ChrisBFX/nanodbc,ChrisBFX/nanodbc,norsync/nanodbc