iosbuild.sh: Add VPX_FRAMEWORK_TARGET preproc symbol
iosbuild.sh: Add VPX_FRAMEWORK_TARGET preproc symbol

Mainly for determining the actual arch when running performance
tests.

Change-Id: Ia6a1c4fcf83e6db1bf94f3e869d146ec32df02f8

liqianggao/libvpx,luctrudeau/aom,thdav/aom,ittiamvpx/libvpx,thdav/aom,Suvarna1488/webm.libvpx,webmproject/libvpx,stewnorriss/libvpx,mwgoldsmith/libvpx,kleopatra999/webm.libvpx,webmproject/libvpx,felipebetancur/libvpx,matanbs/webm.libvpx,hsueceumd/test_hui,luctrudeau/aom,smarter/aom,ittiamvpx/libvpx,VTCSecureLLC/libvpx,altogother/webm.libvpx,n4t/libvpx,goodleixiao/vpx,jmvalin/aom,gshORTON/webm.libvpx,Suvarna1488/webm.libvpx,openpeer/libvpx_new,luctrudeau/aom,ittiamvpx/libvpx-1,running770/libvpx,jdm/libvpx,Maria1099/webm.libvpx,charup/https---github.com-webmproject-libvpx-,kim42083/webm.libvpx,Laknot/libvpx,mbebenita/aom,jacklicn/webm.libvpx,gshORTON/webm.libvpx,GrokImageCompression/aom,Acidburn0zzz/webm.libvpx,Maria1099/webm.libvpx,running770/libvpx,ittiamvpx/libvpx,ittiamvpx/libvpx,Distrotech/libvpx,ittiamvpx/libvpx-1,felipebetancur/libvpx,jmvalin/aom,matanbs/vp982,mwgoldsmith/libvpx,iniwf/webm.libvpx,Maria1099/webm.libvpx,gshORTON/webm.libvpx,reimaginemedia/webm.libvpx,jdm/libvpx,kalli123/webm.libvpx,smarter/aom,reimaginemedia/webm.libvpx,altogother/webm.libvpx,jdm/libvpx,mwgoldsmith/vpx,pcwalton/libvpx,reimaginemedia/webm.libvpx,GrokImageCompression/aom,VTCSecureLLC/libvpx,hsueceumd/test_hui,smarter/aom,felipebetancur/libvpx,liqianggao/libvpx,openpeer/libvpx_new,Topopiccione/libvpx,Acidburn0zzz/webm.libvpx,GrokImageCompression/aom,stewnorriss/libvpx,matanbs/vp982,luctrudeau/aom,kleopatra999/webm.libvpx,ShiftMediaProject/libvpx,shyamalschandra/libvpx,mbebenita/aom,shareefalis/libvpx,kleopatra999/webm.libvpx,openpeer/libvpx_new,hsueceumd/test_hui,Suvarna1488/webm.libvpx,shacklettbp/aom,charup/https---github.com-webmproject-libvpx-,jmvalin/aom,pcwalton/libvpx,shyamalschandra/libvpx,lyx2014/libvpx_c,lyx2014/libvpx_c,matanbs/vp982,Topopiccione/libvpx,stewnorriss/libvpx,mwgoldsmith/vpx,felipebetancur/libvpx,shacklettbp/aom,Distrotech/libvpx,kim42083/webm.libvpx,matanbs/vp982,Laknot/libvpx,reimaginemedia/webm.libvpx,abwiz0086/webm.libvpx,Distrotech/libvpx,matanbs/vp982,Maria1099/webm.libvpx,lyx2014/libvpx_c,zofuthan/libvpx,shyamalschandra/libvpx,kalli123/webm.libvpx,n4t/libvpx,abwiz0086/webm.libvpx,Topopiccione/libvpx,goodleixiao/vpx,stewnorriss/libvpx,jdm/libvpx,matanbs/vp982,mbebenita/aom,webmproject/libvpx,charup/https---github.com-webmproject-libvpx-,jacklicn/webm.libvpx,liqianggao/libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,Distrotech/libvpx,Maria1099/webm.libvpx,jacklicn/webm.libvpx,thdav/aom,altogother/webm.libvpx,Suvarna1488/webm.libvpx,mwgoldsmith/libvpx,Laknot/libvpx,matanbs/webm.libvpx,shacklettbp/aom,matanbs/webm.libvpx,Laknot/libvpx,goodleixiao/vpx,mwgoldsmith/vpx,Distrotech/libvpx,VTCSecureLLC/libvpx,n4t/libvpx,mbebenita/aom,abwiz0086/webm.libvpx,zofuthan/libvpx,ShiftMediaProject/libvpx,GrokImageCompression/aom,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,felipebetancur/libvpx,zofuthan/libvpx,shacklettbp/aom,kim42083/webm.libvpx,n4t/libvpx,zofuthan/libvpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx,mbebenita/aom,Maria1099/webm.libvpx,mbebenita/aom,mbebenita/aom,kleopatra999/webm.libvpx,webmproject/libvpx,reimaginemedia/webm.libvpx,shyamalschandra/libvpx,kalli123/webm.libvpx,shyamalschandra/libvpx,openpeer/libvpx_new,Acidburn0zzz/webm.libvpx,ShiftMediaProject/libvpx,jdm/libvpx,jmvalin/aom,thdav/aom,altogother/webm.libvpx,kleopatra999/webm.libvpx,jdm/libvpx,iniwf/webm.libvpx,Topopiccione/libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,kalli123/webm.libvpx,running770/libvpx,webmproject/libvpx,luctrudeau/aom,kalli123/webm.libvpx,gshORTON/webm.libvpx,Suvarna1488/webm.libvpx,goodleixiao/vpx,ittiamvpx/libvpx-1,iniwf/webm.libvpx,Suvarna1488/webm.libvpx,kim42083/webm.libvpx,zofuthan/libvpx,mwgoldsmith/libvpx,charup/https---github.com-webmproject-libvpx-,n4t/libvpx,kim42083/webm.libvpx,pcwalton/libvpx,lyx2014/libvpx_c,stewnorriss/libvpx,mwgoldsmith/vpx,mbebenita/aom,hsueceumd/test_hui,shareefalis/libvpx,jacklicn/webm.libvpx,GrokImageCompression/aom,charup/https---github.com-webmproject-libvpx-,altogother/webm.libvpx,thdav/aom,charup/https---github.com-webmproject-libvpx-,Topopiccione/libvpx,felipebetancur/libvpx,VTCSecureLLC/libvpx,iniwf/webm.libvpx,mwgoldsmith/vpx,Acidburn0zzz/webm.libvpx,reimaginemedia/webm.libvpx,smarter/aom,stewnorriss/libvpx,mwgoldsmith/vpx,running770/libvpx,hsueceumd/test_hui,shareefalis/libvpx,pcwalton/libvpx,ittiamvpx/libvpx,shacklettbp/aom,smarter/aom,lyx2014/libvpx_c,pcwalton/libvpx,ittiamvpx/libvpx-1,running770/libvpx,shacklettbp/aom,iniwf/webm.libvpx,shareefalis/libvpx,lyx2014/libvpx_c,kalli123/webm.libvpx,jmvalin/aom,openpeer/libvpx_new,running770/libvpx,Distrotech/libvpx,thdav/aom,pcwalton/libvpx,Topopiccione/libvpx,Laknot/libvpx,ShiftMediaProject/libvpx,altogother/webm.libvpx,GrokImageCompression/aom,Laknot/libvpx,webmproject/libvpx,liqianggao/libvpx,matanbs/webm.libvpx,matanbs/webm.libvpx,kim42083/webm.libvpx,shareefalis/libvpx,abwiz0086/webm.libvpx,mbebenita/aom,smarter/aom,ShiftMediaProject/libvpx,luctrudeau/aom,shareefalis/libvpx,hsueceumd/test_hui,shyamalschandra/libvpx,matanbs/webm.libvpx,liqianggao/libvpx,jacklicn/webm.libvpx,mwgoldsmith/libvpx,matanbs/vp982,goodleixiao/vpx,jacklicn/webm.libvpx,goodleixiao/vpx,gshORTON/webm.libvpx,VTCSecureLLC/libvpx,openpeer/libvpx_new,iniwf/webm.libvpx,gshORTON/webm.libvpx,liqianggao/libvpx,zofuthan/libvpx,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,jmvalin/aom