AC_COMPILE_IFELSE->AC_LINK_IFELSE to avoid false rdtsc() positive on FreeBSD/armv6.
AC_COMPILE_IFELSE->AC_LINK_IFELSE to avoid false rdtsc() positive
on FreeBSD/armv6.

sippy/rtpproxy,dsanders11/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy