Upstream-Status:Inappropriate [embedded specific]

fix the below error:
configure: error: cannot run test program while cross compiling

Signed-off-by: Chunrong Guo <B40290@freescale.com>

--- a/m4/sf.m4old    2015-10-28 10:21:20.270557986 +0800
+++ a/m4/sf.m4       2015-10-28 10:23:22.726551974 +0800
@@ -135,20 +135,7 @@
         echo
         exit 1
     fi
-    AC_CACHE_CHECK([for libpcap version >= $1], [daq_cv_libpcap_version_1x], [
-    AC_RUN_IFELSE(
-    [AC_LANG_PROGRAM(
-    [[
-    #include <pcap.h>
-    #include <string.h>
-    extern char pcap_version[];
-    ]],
-    [[
-        if (strcmp(pcap_version, $1) < 0)
-            return 1;
-    ]])],
-    [daq_cv_libpcap_version_1x="yes"],
-    [daq_cv_libpcap_version_1x="no"])])
+    AC_CACHE_CHECK([for libpcap version >= $1], [daq_cv_libpcap_version_1x])
     if test "x$daq_cv_libpcap_version_1x" = "xno"; then
         echo
         echo "    ERROR!  Libpcap library version >= $1  not found."