Switch windows buildbot to new FFmpeg 0.8.1.

Hope it'll work because i haven't got buildbot slave by hand.

build_files/buildbot/slave_compile.py

@@ -108,5 +108,29 @@ else:
 
         sys.exit(0)
     else:
+        # Switch to new FFmpeg library
+        if builder.find('win') != -1:
+            if builder.find('win32') != -1:
+                LCGDIR = '#../lib/windows'
+            elif builder.find('win64') != -1:
+                LCGDIR = '#../lib/win64'
+
+            all_ffmpeg_libs = ['avcodec-53',
+                               'avdevice-53',
+                               'avformat-53',
+                               'avutil-51',
+                               'swscale-2']
+
+            ffmpeg_lib = []
+            ffmpeg_dll = []
+
+            for lib in all_ffmpeg_libs:
+                ffmpeg_lib.append(lib + '.lib')
+                ffmpeg_dll.append('${BF_FFMPEG_LIBPATH}/' + lib + '.lib')
+
+            scons_options.append('BF_FFMPEG=' + LCGDIR + '/ffmpeg-0.8')
+            scons_options.append('BF_FFMPEG_LIB=' + (' '.join(ffmpeg_lib)))
+            scons_options.append('BF_FFMPEG_DLL=' + (' '.join(ffmpeg_dll)))
+
         retcode = subprocess.call(['python', 'scons/scons.py'] + scons_options)
         sys.exit(retcode)