Enable ffserver on Darwin, non-AltiVec regression tests pass.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@5181 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -356,7 +356,6 @@ v4l="no"
 v4l2="no"
 audio_oss="no"
 dv1394="no"
-ffserver="no"
 SHFLAGS="-dynamiclib -Wl,-single_module -Wl,-install_name,\$(libdir)/\$(SLIBNAME),-current_version,\$(SPPVERSION),-compatibility_version,\$(SPPVERSION)"
 extralibs=""
 darwin="yes"