Remove some BeOS/haiku hacks: -fomit-frame-pointer is used anyway,

and -DPIC makes little sense without -fPIC or similar - if -fPIC is
enabled by default, libavutil/internal.h defines PICi anyway.

Originally committed as revision 20486 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1881,9 +1881,6 @@ enabled spic && enable pic
 case $target_os in
     beos|haiku|zeta)
         prefix_default="$HOME/config"
-        # helps building libavcodec
-        add_cppflags -DPIC
-        add_cflags -fomit-frame-pointer
         # 3 gcc releases known for BeOS, each with ugly bugs
         gcc_version="$($cc -v 2>&1 | grep version | cut -d ' ' -f3-)"
         case "$gcc_version" in