As unixodbc_conf.h is now generated by configure instead of
odbc_config[1], it is not necessary to use a custom copy of the header
file anymore.
[1]: be3341cdc6
Signed-off-by: Jeffery To <jeffery.to@gmail.com>
build odbc_config for host so drivers may use it to figure out build
details, patch odbc_config to return target specific values from
unixodbc_conf.h.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
