fuzz: add cstdlib to FuzzedDataProvider #31448

1. 
   fanquake commented at 5:09 pm on December 9, 2024: member

   Same as https://github.com/llvm/llvm-project/pull/113951.

   Avoids compile failures under clang-20 & D_LIBCPP_REMOVE_TRANSITIVE_INCLUDES:

   0In file included from /bitcoin/src/test/fuzz/addition_overflow.cpp:5:
   1/bitcoin/src/test/fuzz/FuzzedDataProvider.h:209:5: error: use of undeclared identifier 'abort'
   2  209 |     abort();
   3      |     ^
   4/bitcoin/src/test/fuzz/FuzzedDataProvider.h:250:5: error: use of undeclared identifier 'abort'
   5  250 |     abort();
   

2. fuzz: add cstdlib to FuzzedDataProvider

   Same as https://github.com/llvm/llvm-project/pull/113951.
   
   Avoids compile failures under clang-20 &
   `D_LIBCPP_REMOVE_TRANSITIVE_INCLUDES`:
   ```bash
   In file included from /bitcoin/src/test/fuzz/addition_overflow.cpp:5:
   /bitcoin/src/test/fuzz/FuzzedDataProvider.h:209:5: error: use of undeclared identifier 'abort'
     209 |     abort();
         |     ^
   /bitcoin/src/test/fuzz/FuzzedDataProvider.h:250:5: error: use of undeclared identifier 'abort'
     250 |     abort();
   ```

   bb7e686341
3. 
   DrahtBot commented at 5:09 pm on December 9, 2024: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/31448.

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4. DrahtBot added the label Tests on Dec 9, 2024
5. dergoegge approved
6. 
   dergoegge commented at 5:16 pm on December 9, 2024: member

   utACK bb7e686341e437b2e7aae887827710918c00ae0f
7. brunoerg approved
8. 
   brunoerg commented at 5:40 pm on December 9, 2024: contributor

   ACK bb7e686341e437b2e7aae887827710918c00ae0f
9. fanquake merged this on Dec 10, 2024
10. fanquake closed this on Dec 10, 2024

    ---

11. fanquake deleted the branch on Dec 10, 2024
12. achow101 added the label Needs backport (28.x) on Dec 11, 2024
13. achow101 referenced this in commit 2835158be0 on Dec 11, 2024
14. fanquake removed the label Needs backport (28.x) on Dec 17, 2024

Contributors
fanquake DrahtBot dergoegge brunoerg

Labels
Tests