joystick: Fix up Linux joystick code to (mostly) compile on FreeBSD.

configure.ac

@@ -2603,8 +2603,22 @@ dnl See if we can use the new unified event interface in Linux 2.4
 CheckInputEvents()
 {
     dnl Check for Linux 2.4 unified input event interface support
-        AC_MSG_CHECKING(for Linux 2.4 unified input interface)
-        use_input_events=no
+    AC_MSG_CHECKING(for Linux 2.4 unified input interface)
+    use_input_events=no
+
+    dnl FreeBSD puts this in /usr/include/dev/evdev/input.h ...
+    AC_TRY_COMPILE([
+      #include <dev/evdev/input.h>
+    ],[
+      #ifndef EVIOCGNAME
+      #error EVIOCGNAME() ioctl not available
+      #endif
+    ],[
+      use_input_events=yes
+    ])
+
+    dnl And Linux of course puts it in linux/input.h ...
+    if test x$use_input_events = xno; then
         AC_TRY_COMPILE([
           #include <linux/input.h>
         ],[
@@ -2614,11 +2628,13 @@ CheckInputEvents()
         ],[
         use_input_events=yes
         ])
-        AC_MSG_RESULT($use_input_events)
-        if test x$use_input_events = xyes; then
-            AC_DEFINE(SDL_INPUT_LINUXEV, 1, [ ])
-            SUMMARY_input="${SUMMARY_input} linuxev"
-        fi
+    fi
+
+    AC_MSG_RESULT($use_input_events)
+    if test x$use_input_events = xyes; then
+      AC_DEFINE(SDL_INPUT_LINUXEV, 1, [ ])
+      SUMMARY_input="${SUMMARY_input} linuxev"
+    fi
 }
 
 dnl See if we can use the kernel kd.h header