Force ebp_available for icc.

See discussion:
http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/86209

Originally committed as revision 17985 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -2181,6 +2181,8 @@ if enabled icc; then
     check_ldflags -wd10156,11030
     # Allow to compile with optimizations
     check_ldflags -march=$cpu
+    # icc 11.0 and 11.1 work with ebp_available, but don't pass the test
+    enable ebp_available
 elif enabled ccc; then
     # disable some annoying warnings
     add_cflags -msg_disable cvtu32to64