Typoes:  "whith" -> "with"

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/Makefile b/Makefile
index 0f84c74..89f2d8b 100644
--- a/Makefile
+++ b/Makefile
@@ -1484,7 +1484,7 @@
 # Single targets
 # ---------------------------------------------------------------------------
 # Single targets are compatible with:
-# - build whith mixed source and output
+# - build with mixed source and output
 # - build with separate output dir 'make O=...'
 # - external modules
 #