Mention FunctionCheck

docs/Glibc_vs_uClibc_Differences.txt

@@ -206,3 +206,6 @@ Prospect is another alternative based on OProfile:
 And the Linux Trace Toolkit (LTT) is also a fine tool:
     http://www.opersys.com/LTT/
 
+FunctionCheck:
+	http://www710.univ-lyon1.fr/~yperret/fnccheck/
+