ensure clock_gettime symbol is found
ensure clock_gettime symbol is found

got link error liblxc.so: undefined reference to `clock_gettime'
clock_gettime is used by lxclock.c and is in librt, or bionic libc.

Signed-off-by: Dwight Engen <1793d65cf7b9eefb2bb8f5bee9a4b8ba782c26da@oracle.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

virajs/lxc,armcc/lxc,federicobriata/lxc,weizhenwei/lxc,LynxChaus/lxc,yubo/lxc,aeris/lxc,hfuCN/lxc,regit/lxc,bmoar/lxc,JohnPeacockMessageSystems/lxc,major/lxc,ss1h2a3tw/lxc,Ponce/lxc,hfuCN/lxc,smoser/lxc,jirislaby/lxc,aeris/lxc,szaszg/lxc,codebauss/lxc,weizhenwei/lxc,fwilson42/lxc,bostjan/lxc,ioops/lxc,bostjan/lxc,raspberrypython/lxc,major/lxc,glensc/lxc,ecarrara/lxc,christiaan/lxc,bmoar/lxc,thmo/lxc,rldleblanc/lxc,jirislaby/lxc,JohnPeacockMessageSystems/lxc,lazy404/lxc,yubo/lxc,hallyn/lxc,armcc/lxc,DarknessBeforeDawn/lxc,Distrotech/lxc,tych0/lxc,QingweiPeterLan/cs188-lxc,terceiro/lxc,Ponce/lxc,DarknessBeforeDawn/lxc,abstrakraft/lxc-android-lxc,akshaykarle/lxc,ecarrara/lxc,abstrakraft/lxc-android-lxc,rowhit/lxc,christiaan/lxc,ecarrara/lxc,fwilson42/lxc,GreatFruitOmsk/lxc,hkjolhede/lxc,ojkastl/lxc_Patches,Ponce/lxc,cjwatson/lxc,akshaykarle/lxc,jirislaby/lxc,lisongmin/lxc,glensc/lxc,ksperis/lxc,fwilson42/lxc,ioops/lxc,LynxChaus/lxc,terceiro/lxc,codebauss/lxc,abstrakraft/lxc-android-lxc,ss1h2a3tw/lxc,efiop/lxc,ksperis/lxc,aeris/lxc,caglar10ur/lxc,LynxChaus/lxc,GreatFruitOmsk/lxc,akshaykarle/lxc,Distrotech/lxc,federicobriata/lxc,weizhenwei/lxc,GreatFruitOmsk/lxc,caglar10ur/lxc,szaszg/lxc,glensc/lxc,Pelagicore/lxc,yubo/lxc,thmo/lxc,terceiro/lxc,ksperis/lxc,smoser/lxc,virajs/lxc,efiop/lxc,smoser/lxc,ojkastl/lxc_Patches,sapun/lxc,szaszg/lxc,rldleblanc/lxc,regit/lxc,ojkastl/lxc_Patches,sapun/lxc,ysbnim/lxc,DarknessBeforeDawn/lxc,cjwatson/lxc,hkjolhede/lxc,abstrakraft/lxc-android-lxc,lazy404/lxc,ysbnim/lxc,christiaan/lxc,Pelagicore/lxc,hallyn/lxc,major/lxc,QingweiPeterLan/cs188-lxc,raspberrypython/lxc,rowhit/lxc,regit/lxc,codebauss/lxc,cjwatson/lxc,tych0/lxc,rldleblanc/lxc,ojkastl/lxc_Patches,lazy404/lxc,ysbnim/lxc,QingweiPeterLan/cs188-lxc,smoser/lxc,caglar10ur/lxc,hfuCN/lxc,ss1h2a3tw/lxc,lisongmin/lxc,hallyn/lxc,armcc/lxc,rowhit/lxc,tych0/lxc,thmo/lxc,virajs/lxc,bmoar/lxc,Distrotech/lxc,lisongmin/lxc,raspberrypython/lxc,JohnPeacockMessageSystems/lxc,hkjolhede/lxc,federicobriata/lxc,Pelagicore/lxc,sapun/lxc,bostjan/lxc,efiop/lxc,ioops/lxc