[PR] nuttx/spinlock: Define spinlock_t as size 0 if spinlocks are not used [nuttx]

[via GitHub]

pussuw opened a new pull request, #16165:
URL: https://github.com/apache/nuttx/pull/16165

   ## Summary
   
   Saves 1 byte per spinlock, if spinlocks are not used.
   
   ## Impact
   
   Reduce RAM usage by 1 byte per defined spinlock, if CONFIG_SPINLOCK=n.
   
   ## Testing
   
   rv-virt:nsh64 + ostest
   CI pass
   
   ## Comparison
   BEFORE:
   $ riscv64-unknown-elf-size nuttx
      text         data     bss     dec     hex filename
    199100         1513   14960  215573   34a15 nuttx
   
   AFTER:
   $ riscv64-unknown-elf-size nuttx
      text         data     bss     dec     hex filename
    199072         1505   14960  215537   349f1 nuttx
   
   
   
   


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