Merge pull request #299005 from NickCao/postgrespin

postgresql: enable spinlock on riscv

pkgs/servers/sql/postgresql/generic.nix

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       ++ lib.optionals zstdEnabled [ "--with-zstd" ]
       ++ lib.optionals gssSupport [ "--with-gssapi" ]
       ++ lib.optionals pythonSupport [ "--with-python" ]
-      ++ lib.optionals stdenv'.hostPlatform.isRiscV [ "--disable-spinlocks" ]
       ++ lib.optionals jitSupport [ "--with-llvm" ]
       ++ lib.optionals stdenv'.isLinux [ "--with-pam" ];