Remove an obsolete TODO

BUG=aomedia:2629

Change-Id: Ied6cc8306c75d7275355c6e8b2246f0bfeb70ff8

aom/aom_integer.h

diff --git a/aom/aom_integer.h b/aom/aom_integer.h
index 90263bd..accb332 100644
--- a/aom/aom_integer.h
+++ b/aom/aom_integer.h
@@ -19,7 +19,6 @@
 #define AOM_INLINE __inline
 #else
 #define AOM_FORCE_INLINE __inline__ __attribute__((always_inline))
-// TODO(jbb): Allow a way to force inline off for older compilers.
 #define AOM_INLINE inline
 #endif