Issue compiling with MinGW because of argument named errno

[ddeclerck]

When compiling with MinGW, I have errors in ocpgsql.c on th function OCDB_PGSetLibErrorStatus.
The problem comes from one of the argument names : OCDB_PGSetLibErrorStatus(struct sqlca_t *st, int errno). Since errno is implemented as a macro (at least in my environment), the argument gets expanded intro something that is not an identifier (actually an expression), hence the compilation fails.