Remove unneeded -nostart SHFLAG for Haiku.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@23564 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -2127,7 +2127,6 @@ enabled spic && enable pic
 case $target_os in
     haiku)
         prefix_default="$HOME/config"
-        SHFLAGS=-nostart
         enable audio_beos
         ;;
     sunos)