change ellipse.c #if STANDALONE to #ifdef

From later usage of this macro in the same file, it looks like this is what was
intended. Squashes a -Wundef build warning.

diff --git a/lib/common/ellipse.c b/lib/common/ellipse.c
index 97c0dfa209e17b35750548180b8e522b6bcce269..ceb983bc33d4e77921face4aec508700220b3aa8 100644 (file)
--- a/lib/common/ellipse.c
+++ b/lib/common/ellipse.c
@@ -47,7 +47,7 @@
  */
 
 #include <stdbool.h>
-#if STANDALONE
+#ifdef STANDALONE
 #include <limits.h>
 #include <math.h>
 #include <stdlib.h>