Add wapp src as include directory

compile

@@ -1,3 +1,3 @@
 #!/bin/bash
 
-(set -x ; clang -g intern/wapp/src/wapp.c uuid4.c -o uuid4)
+(set -x ; clang -g -Iintern/wapp/src intern/wapp/src/wapp.c uuid4.c -o uuid4)

uuid4.c

@@ -1,5 +1,4 @@
-#include "intern/wapp/src/common/wapp_common.h"
-#include "intern/wapp/src/prng/wapp_prng.h"
+#include "wapp.h"
 #include <inttypes.h>
 #include <stdio.h>