Drop Bitstream Vera fonts from 60-latin.conf

Bitstream Vera fonts seems broken so dropped them there.

Fixes fontconfig/fontconfig#26
3 jobs for issue/26 in 21 minutes and 52 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #2914592
mingw-build

00:21:52

passed #2914587
shared-build

00:08:22

passed #2914590
static-build

00:06:55