depends: avoid an unset CMAKE_OBJDUMP #31857

1. 
   fanquake commented at 1:07 pm on February 13, 2025: member

   Similar to #31840, currently our Linux toolchain file contains:

   0set(CMAKE_AR "aarch64-linux-gnu-ar")
   1set(CMAKE_RANLIB "aarch64-linux-gnu-ranlib")
   2set(CMAKE_STRIP "aarch64-linux-gnu-strip")
   3set(CMAKE_OBJCOPY "aarch64-linux-gnu-objcopy")
   4set(CMAKE_OBJDUMP "")
   

   objdump is currently only used for the macOS cross build, where it’s llvm-objdump, but we should be consistent in producing a toolchain file that points to actual tools, rather than leaving variables unset.

2. depends: avoid an unset CMAKE_OBJDUMP

   Similar to #31840, currently our Linux toolchain file contains:
   ```bash
   set(CMAKE_AR "aarch64-linux-gnu-ar")
   set(CMAKE_RANLIB "aarch64-linux-gnu-ranlib")
   set(CMAKE_STRIP "aarch64-linux-gnu-strip")
   set(CMAKE_OBJCOPY "aarch64-linux-gnu-objcopy")
   set(CMAKE_OBJDUMP "")
   ```
   
   `objdump` is currently only used for the macOS cross build, where it's
   `llvm-objdump`, but we should be consistent in producing a toolchain
   file that points to actual tools, rather than leaving variables unset.

   2434aeab62
3. 
   DrahtBot commented at 1:08 pm on February 13, 2025: 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/31857.

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   Type	Reviewers
   ACK	hebasto, theuni

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4. DrahtBot added the label Build system on Feb 13, 2025
5. hebasto approved
6. 
   hebasto commented at 1:36 pm on February 13, 2025: member

   ACK 2434aeab62ba07c5380112838f3600b3dbbceef2.
7. theuni approved
8. 
   theuni commented at 7:56 pm on February 13, 2025: member

   utACK 2434aeab62ba07c5380112838f3600b3dbbceef2
9. fanquake merged this on Feb 14, 2025
10. fanquake closed this on Feb 14, 2025

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11. fanquake deleted the branch on Feb 14, 2025

Contributors
fanquake DrahtBot hebasto theuni

Labels
Build system