Makefile.am: Don't use dots in -osuf
Makefile.am: Don't use dots in -osuf

This fixes
  ./configure --enable-haskell-tests && make hs-tests
builds on GHC 7.8.

It changes `-osuf .ext` to `-osuf ext`; the old form was allowed in
GHC <= 7.6, but GHC 7.8 seems to have problems with it:
  https://ghc.haskell.org/trac/ghc/ticket/9760

The form without dot works in all GHC versions, and we don't have
dots in other -osuf arguments in the same file either, so this
was probably an accident.

Signed-off-by: Niklas Hambuechen <98215d3a72cb13cc9c9956528e50119ca7d1fb8b@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

onponomarev/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,onponomarev/ganeti,yiannist/ganeti,andir/ganeti,ganeti/ganeti,leshchevds/ganeti,apyrgio/ganeti,mbakke/ganeti,dimara/ganeti,leshchevds/ganeti,leshchevds/ganeti,grnet/snf-ganeti,andir/ganeti,mbakke/ganeti,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,yiannist/ganeti,yiannist/ganeti,ganeti/ganeti,ganeti/ganeti,bitemyapp/ganeti,grnet/snf-ganeti,bitemyapp/ganeti,andir/ganeti,dimara/ganeti