Don't display last 100 lines

In many cases, the error does not appear in the last 100 lines. Let it
up to the user to investigate... just point him to the right file.

build.sh

@@ -61,11 +61,7 @@ default_version() {
 }
 
 failure() {
-	echo "Build of $KALI_DIST/$KALI_ARCH live image failed" >&2
-	if [ -z "$VERBOSE" ]; then
-		echo "Last 100 lines of build.log:" >&2
-		tail -n 100 build.log >&2
-	fi
+	echo "Build of $KALI_DIST/$KALI_ARCH live image failed (see build.log for details)" >&2
 	exit 2
 }