Add functionpointer5 to regression integration tests

Add binaries compiled from the following source code to regression tests. Fix found problems. Test standard combinations, as well as these:
- `ARM, -O2, --strip`
- `x86, -O2, --no-debug-info`

```c
typedef int (*ptr2func)(int, int);

int plus(int a, int b)
{
return a + b;
}

int minus(int a, int b)
{
return a - b;
}

int evaluate(int a, int b, ptr2func f)
{
return f(a,b);
}

int main(int argc, char *argv[])
{
int a;
if (argc > 2)
a = evaluate(1, 2, plus);
else
a = evaluate(1, 2, minus);

return a;
}
```

Start by locating the regression integration tests and existing compiled-binary fixtures, then use the provided C program with its main entry point as the new case. Compile it for the standard combinations and the specified ARM and x86 options; done means the binaries are included and all regression tests pass.

Written by the indexing model from the issue text.