Changed the build system to drop I2C for now. Seems to cause too many issues

on non Raspbian systems (and even on some Raspbian systems it would appear ):

fixed a timing issue on softTone
fixed some issues in wiringPisetup introduced when optimising the mmap calls.

gpio/gpio.c

@@ -42,7 +42,7 @@ extern int wiringPiDebug ;
 #  define	FALSE	(1==2)
 #endif
 
-#define	VERSION	"1.7"
+#define	VERSION	"1.8"
 
 static int wpMode ;