[msan] Fix potential infinite recursion in a test.

If printf is intercepted (it is not atm), REAL(printf) call in the interceptor
would get redirected back to my_lgamma, resulting in infinite recursion.

llvm-svn: 208294

compiler-rt/test/msan/wrap_indirect_calls_in_rtl.cc

@@ -34,7 +34,6 @@ int my_gettimeofday(struct timeval *p, void *q) {
 }
 
 double my_lgamma(double x) {
-  printf("zzz\n");
   return x;
 }