Fix broken simulator build with weird sdl-config

* --static-libs isn't supported on some (possibly newer) SDL installs, falls back to --libs if this is the case

Patch mostly by Amaury Pouly.

Change-Id: I6dd2f4847f2a2d1de7b2d287c0af6651cec461ff

tools/configure

@@ -339,13 +339,18 @@ simcc () {
         echo "don't have SDL (properly) installed. Please correct and"
         echo "re-run configure!"
         exit 2
-    else 
+    else
         # generic sdl-config checker
         GCCOPTS="$GCCOPTS `$sdl --cflags`"
-        LDOPTS="$LDOPTS `$sdl --static-libs`"
+        if sdl-config --static-libs > /dev/null 2>&1 ; then
+            LDOPTS="$LDOPTS `$sdl --static-libs`"
+        else
+            echo "Your sdl-config does not know about static libs, falling back to shared library"
+            LDOPTS="$LDOPTS `$sdl --libs`"
+        fi
     fi
  fi
- 
+
 
  GCCOPTS="$GCCOPTS -I\$(SIMDIR)"
  # x86_64 supports MMX by default