Added stub Steam Controller sources to Android and iOS command line builds

configure

@@ -23847,6 +23847,7 @@ $as_echo "#define SDL_JOYSTICK_LINUX 1" >>confdefs.h
 $as_echo "#define SDL_JOYSTICK_ANDROID 1" >>confdefs.h
 
                 SOURCES="$SOURCES $srcdir/src/joystick/android/*.c"
+                SOURCES="$SOURCES $srcdir/src/joystick/steam/*.c"
                 have_joystick=yes
             ;;
           esac
@@ -24244,6 +24245,7 @@ $as_echo "#define SDL_AUDIO_DRIVER_COREAUDIO 1" >>confdefs.h
 $as_echo "#define SDL_JOYSTICK_MFI 1" >>confdefs.h
 
             SOURCES="$SOURCES $srcdir/src/joystick/iphoneos/*.m"
+            SOURCES="$SOURCES $srcdir/src/joystick/steam/*.c"
             have_joystick=yes
         fi
         # Set up files for the haptic library