BUG #13277: ODBC config broken

The following bug has been logged on the website:

Bug reference:      13277
Logged by:          Kajetan Abt
Email address:      kajetan.abt@cyfex.com
PostgreSQL version: 9.4.1
Operating system:   Windows 8.1
Description:

It seems that it is impossible to programmatically create a data source on
Windows 8. Neither odbcconf.exe /A {CONFIGDSN ....} nor
SQLConfigDataSource(...) seem to work at all. The former return an unclear
error mesage, the latter actually corrupts the heap. My use case was trying
to add a new data source for the current user with Postgres Unicode(x64) as
a driver. I tried both an older driver version (in the 8-range), and two
more current ones, namely 9.3.300 and 9.3.400.