Merge #15233: Prevent mutex lock fail even if --enable-debug

b09dab0f2d Prevent mutex lock fail even if --enable-debug (Akio Nakamura)

Pull request description:

  This PR intends to resolve #15227.

  ```configure --enable-debug```  enables ```#ifdef DEBUG_LOCKORDER```.

  Then ```lockdata``` (in sync.cpp) will be initialized same as other static objects.

  But unfortunately, ```lockdata.push_lock()``` was called before its initialization (via initializing ```signatureCache``` which is declared in ```script/sigcache.cpp```) on macOS.

  This PR apply the "Construct On First Use Idiom" to ```lockdata``` to prevent it.

  edited --- fix typo.

Tree-SHA512: 59df99ef78a335b1b7ebed7207d4719ea4412900eea38739f6e8eaaba1f594e1950044851659ce83f4f69813fc96978244bd176676e1aa2277c813ede832e6fb

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