Fix compilation error caused by tgmath.h.

On CentOS calling functions from <tgmath.h> produces multiple errors "'void*' is not a pointer-to-object type".

llvm-svn: 329597

lldb/lit/Expr/Inputs/anonymous-struct.cpp

@@ -1,4 +1,4 @@
-#include <tgmath.h>
+#include <cmath>
 
 typedef struct {
     float f;