Use check_lib2 instead of check_lib in SDL test. This is helpful in

combination with different calling/naming conventions as used in the
OS/2 port of SDL.
patch by Myung-Hun, komh a chollian d net

Originally committed as revision 11545 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1694,7 +1694,7 @@ if "${SDL_CONFIG}" --version >/dev/null 2>&1; then
     sdl_cflags=`"${SDL_CONFIG}" --cflags`
     temp_cflags $sdl_cflags
     temp_extralibs `"${SDL_CONFIG}" --libs`
-    if check_lib SDL.h SDL_Init; then
+    if check_lib2 SDL.h SDL_Init; then
         _sdlversion=`"${SDL_CONFIG}" --version | sed 's/[^0-9]//g'`
         if test "$_sdlversion" -lt 121 ; then
             enable sdl_too_old