clamav: Update to 0.99.3

Excerpt from 'README':

"ClamAV 0.99.3 is a hotfix release to patch a set of vulnerabilities.

- fixes for the following CVE's: CVE-2017-6418, CVE-2017-6420,
  CVE-2017-12374, CVE-2017-12375, CVE-2017-12376, CVE-2017-12377,
  CVE-2017-12378, CVE-2017-12379, CVE-2017-12380.
- also included are 2 minor fixes to properly detect openssl install
  locations on FreeBSD 11, and prevent false warnings about zlib 1.2.1#
  version numbers."

For details see:
http://blog.clamav.net/2018/01/clamav-0993-has-been-released.html

Best,
Matthias

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/patches/clamav/llvm-glibc.patch

@@ -2,7 +2,7 @@ Index: clamav-0.97.3/libclamav/c++/llvm/lib/ExecutionEngine/JIT/Intercept.cpp
 ===================================================================
 --- clamav-0.97.3.orig/libclamav/c++/llvm/lib/ExecutionEngine/JIT/Intercept.cpp
 +++ clamav-0.97.3/libclamav/c++/llvm/lib/ExecutionEngine/JIT/Intercept.cpp
-@@ -52,6 +52,7 @@ static void runAtExitHandlers() {
+@@ -55,6 +55,7 @@ static void runAtExitHandlers() {
  #include <sys/stat.h>
  #endif
  #include <fcntl.h>