rfkill: provide RFKILL_TYPE_FM if undefined

As discussed last year it's nice to be compatible to 2.6.32
https://www.spinics.net/lists/util-linux-ng/msg13963.html

BTW also re-define NUM_RFKILL_TYPES if needed, although we are
not really using it.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>

sys-utils/rfkill.c

@@ -45,7 +45,12 @@
  * year 2009 (2.6.33) or older.
  */
 #ifndef RFKILL_TYPE_NFC
+# ifndef RFKILL_TYPE_FM
+#  define RFKILL_TYPE_FM	RFKILL_TYPE_GPS + 1
+# endif
 # define RFKILL_TYPE_NFC	RFKILL_TYPE_FM + 1
+# undef NUM_RFKILL_TYPES
+# define NUM_RFKILL_TYPES	RFKILL_TYPE_NFC + 1
 #endif
 
 struct rfkill_type_str {