Compile fix for the latest MSVC compiler (MSVC 19.26.28806.0, from Visual Studio 16.6.2)#3576

Merged

chalcolith merged 2 commits intomasterfrom vs_compiler_fix

Jun 22, 2020

Commits on Jun 16, 2020

Add an explicit constructor to pool_block_t to satisfy the latest Microsoft compiler.
chalcolith
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Only enable this fix for Windows MSVC.
chalcolith
committed