libelf: vendor as full-fork recipe (path=source, patches baked)

local/recipes/dev/libelf/source/tests/testfile_implicit_pointer.c

@@ -0,0 +1,12 @@
+// gcc -g -O2 -o implicit_pointer implicit_pointer.c
+
+static __attribute__((noinline, noclone)) int foo (int i)
+{
+  int *p = &i;
+  return *p;
+}
+
+int main (void)
+{
+  return foo (23) - 23;
+}