Only declare the start/end variables in case CONFIG_DEBUG_FRAME is defined.
Only declare the start/end variables in case CONFIG_DEBUG_FRAME is defined.

Prevents compiler warnings about unused variables.

Signed-off-by: Ken Werner <ae36958ca69fd249ce813d415cd5831a3fb45335@linaro.org>

libunwind/libunwind,libunwind/libunwind,unkadoug/libunwind,jrmuizel/libunwind,pathscale/libunwind,Chilledheart/libunwind,atanasyan/libunwind-android,martyone/libunwind,geekboxzone/lollipop_external_libunwind,zeldin/platform_external_libunwind,dagar/libunwind,vegard/libunwind,Keno/libunwind,lat/libunwind,frida/libunwind,DroidSim/platform_external_libunwind,CyanogenMod/android_external_libunwind,olibc/libunwind,SyndicateRogue/libunwind,atanasyan/libunwind,evaautomation/libunwind,SyndicateRogue/libunwind,cloudius-systems/libunwind,Keno/libunwind,evaautomation/libunwind,krytarowski/libunwind,project-zerus/libunwind,joyent/libunwind,wdv4758h/libunwind,adsharma/libunwind,rogwfu/libunwind,lat/libunwind,dreal-deps/libunwind,fdoray/libunwind,pathscale/libunwind,cloudius-systems/libunwind,tronical/libunwind,DroidSim/platform_external_libunwind,pathscale/libunwind,bo-on-software/libunwind,tony/libunwind,ehsan/libunwind,vtjnash/libunwind,atanasyan/libunwind,mpercy/libunwind,fdoray/libunwind,djwatson/libunwind,bo-on-software/libunwind,vegard/libunwind,atanasyan/libunwind,mpercy/libunwind,vtjnash/libunwind,mpercy/libunwind,jrmuizel/libunwind,android-ia/platform_external_libunwind,tony/libunwind,fillexen/libunwind,ehsan/libunwind,joyent/libunwind,dropbox/libunwind,android-ia/platform_external_libunwind,rogwfu/libunwind,rntz/libunwind,martyone/libunwind,rantala/libunwind,fdoray/libunwind,geekboxzone/lollipop_external_libunwind,CyanogenMod/android_external_libunwind,dropbox/libunwind,tony/libunwind,frida/libunwind,lat/libunwind,project-zerus/libunwind,maltek/platform_external_libunwind,igprof/libunwind,androidarmv6/android_external_libunwind,maltek/platform_external_libunwind,rantala/libunwind,igprof/libunwind,martyone/libunwind,fillexen/libunwind,unkadoug/libunwind,ehsan/libunwind,adsharma/libunwind,Keno/libunwind,DroidSim/platform_external_libunwind,yuyichao/libunwind,unkadoug/libunwind,androidarmv6/android_external_libunwind,geekboxzone/mmallow_external_libunwind,dagar/libunwind,frida/libunwind,android-ia/platform_external_libunwind,krytarowski/libunwind,cms-externals/libunwind,wdv4758h/libunwind,olibc/libunwind,Chilledheart/libunwind,vegard/libunwind,zliu2014/libunwind-tilegx,olibc/libunwind,cloudius-systems/libunwind,androidarmv6/android_external_libunwind,bo-on-software/libunwind,CyanogenMod/android_external_libunwind,SyndicateRogue/libunwind,vtjnash/libunwind,Chilledheart/libunwind,rntz/libunwind,djwatson/libunwind,rntz/libunwind,rantala/libunwind,joyent/libunwind,zeldin/platform_external_libunwind,yuyichao/libunwind,zliu2014/libunwind-tilegx,maltek/platform_external_libunwind,tkelman/libunwind,yuyichao/libunwind,atanasyan/libunwind-android,fillexen/libunwind,wdv4758h/libunwind,tkelman/libunwind,dreal-deps/libunwind,geekboxzone/lollipop_external_libunwind,dropbox/libunwind,atanasyan/libunwind-android,igprof/libunwind,zliu2014/libunwind-tilegx,cms-externals/libunwind,project-zerus/libunwind,evaautomation/libunwind,djwatson/libunwind,krytarowski/libunwind,libunwind/libunwind,tronical/libunwind,dreal-deps/libunwind,cms-externals/libunwind,dagar/libunwind,jrmuizel/libunwind,rogwfu/libunwind,geekboxzone/mmallow_external_libunwind,zeldin/platform_external_libunwind,tkelman/libunwind,geekboxzone/mmallow_external_libunwind,adsharma/libunwind,tronical/libunwind