stats: fix static link

The stats.c file does not use the dlopen() familly of functions, but
includes dlfcn.h, which is missing on uClibc when it is configured as
a static-only C library.

so, simply do not include dlfcn.h.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

diff -durN clamav-0.98.5.orig/libclamav/stats.c clamav-0.98.5/libclamav/stats.c
--- clamav-0.98.5.orig/libclamav/stats.c	2014-11-13 23:30:43.000000000 +0100
+++ clamav-0.98.5/libclamav/stats.c	2014-11-25 19:57:14.344291266 +0100
@@ -41,7 +41,6 @@
 #include <sys/sysctl.h>
 #endif
 #endif
-#include <dlfcn.h>
 #else
 #include <Windows.h>
 #include <tchar.h>