Better header files

* Header files isa.h, sensors.h and smbus.h will now be installed on a
  'make install';
* #ifdef __KERNEL__ added to the above header files where appropriate;
* Correct files are included, both if __KERNEL__ is true and false.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@42 7894878c-1315-0410-8ee3-d5d059ff63e0

kernel/include/smbus.h

@@ -26,7 +26,6 @@
    OK, earlier versions are not; later versions will probably give problems
    too. 
 */
-#include "i2c.h"
 #include <asm/types.h>
 
 /* SPINLOCK is defined in i2c.h. */
@@ -36,6 +35,12 @@
 #include <asm/semaphore.h>
 #endif
 
+#ifdef LM_SENSORS
+#include "i2c.h"
+#else
+#include <linux/i2c.h>
+#endif
+
 /* Declarations, to keep the compiler happy */
 struct smbus_driver;
 struct smbus_client;