[lit] Rather than including stdio.h, forward-declare printf in TestConvenienceVariables.test

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@349573 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lit/Driver/Inputs/hello.c b/lit/Driver/Inputs/hello.c
index 60d6f75..ad8e6f3 100644
--- a/lit/Driver/Inputs/hello.c
+++ b/lit/Driver/Inputs/hello.c
@@ -1,4 +1,4 @@
-#include <stdio.h>
+int printf(const char *format, ...);
 
 int main(int argc, char **argv) {
   printf("Hello World\n");