Update Linux build instructions to use Clang-18 with libc++ and latest TDLib#1

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copilot/fix-1c3dea41-45ef-4889-bde1-30474ca83356Sammers21/tdlib-java-builds:copilot/fix-1c3dea41-45ef-4889-bde1-30474ca83356Copy head branch name to clipboard