Add second memory leak

[bangarumahesh22]

This PR adds examples/leak_example2.c, a small intentional memory-leak example for Dr. Memory demos and testing.

• File: examples/leak_example2.c
• Purpose: simple program that allocates memory and does not free it (used to demonstrate leak detection).
• Verified locally: ran with Dr. Memory (../build/bin/drmemory -- ../examples/leak_example2) and confirmed a reported leak.

Please let me know if you'd like the example to be modified (e.g., add comments or a README entry).

[derekbruening]

As in #2567, I am a little confused: so you are proposing creating a new directory examples/? Will these be used in automated tests? What is the bigger picture here: could you file a feature issue in the tracker and describe the goal and link this PR to that new issue?

[bangarumahesh22]

Thank you @derekbruening for your patience and feedback.

I've just responded to your similar question in #2567, and the same applies here:

This PR is creating new example files (examples/leak_example2.c and examples/test_hacktober.c), not editing existing files. I should have made this clearer in my PR descriptions.

Regarding your questions about the bigger picture:

You're absolutely right to ask. I realize now that I:

• Created these PRs during Hacktoberfest without proper discussion
• Don't have a clear plan for how these integrate with the project
• Should have filed a feature issue first before implementing

What I propose:

1. I can close these PRs (Fix memory leak in test example #2567, Add second memory leak #2568, Add signal_buffer_leak example for memory leak detection #2569) since they were submitted without proper planning
2. If the project would benefit from example files, I'm happy to file a proper feature request describing:
   • The purpose and use cases
   • How they'd integrate with documentation/tests
   • What examples would be most valuable
3. Wait for maintainer feedback before implementing anything

I apologize for the confusion and for not following proper contribution procedures. Would you prefer I close these PRs?