don't set INLINE to 'always_inline'

INLINE is used quite widely in vp9, this change improves performance
1-2% on most modern platforms.

Change-Id: I8a9974aab89fa588ea4923cc7eaf6199e344a528

build/make/configure.sh

@@ -1271,9 +1271,6 @@ EOF
     # Try to find which inline keywords are supported
     check_cc <<EOF && INLINE="inline"
 static inline function() {}
-EOF
-    check_cc <<EOF && INLINE="__inline__ __attribute__((always_inline))"
-static __attribute__((always_inline)) function() {}
 EOF
 
   # Almost every platform uses pthreads.