package/clamav: bump to version 0.99

- removed autoreconf and two patches applied upstream
https://github.com/vrtadmin/clamav-devel/commit/b20eeffadb7675bf1a74e35b0aef80e26e1c0462
https://github.com/vrtadmin/clamav-devel/commit/785e4a90e0b5bf60f55eb0987300da2e1e12abbb

- removed clamuko configure option
- disabled fanotify support because UCLIBC_HAS_FTS is disabled
https://github.com/vrtadmin/clamav-devel/blob/master/README


"Support for on-access scanning using Clamuko/Dazuko has been replaced
 with fanotify."

- added host-pkgconf dependency, used by configure
- added optional dependency to pcre
- added sha256 hash

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>