wine-staging wineodbc fix

[DodoGTA GT]

Hello,

I've noticed that the wine-staging wineodbc library fails to compile
ever since it got introduced in commit
14f63f40e7c87dc87ca1dc64aaa66f344bada4da (but only for 32-bit)

This is because the unixlib part of wineodbc requires linking to
libodbc (which is rarely present on 32-bit) and because libodbc isn't
present, there's a lot of missing symbols

The Wine configure.ac does have some checks to prevent building of the
whole odbc component if libodbc is missing (but that only works for
odbc32, not wineodbc)

To fix this issue, enable_odbc32 can be edited to enable_wineodbc in
the configure.ac file (make sure to run autoreconf to actually include
the fix in the configure script too)

Thanks