v2.2.1: Build Hardening 🏗

• Fix: mood may not be initialized (a7a76b3)
• Fix: Static functions should be inlined (ec9020d)
• Fix: MSVC 4505 & 4324 warnings (4f23aa5)
• Fix: MSVC compilation warnings (d3c3b14)
• Make: Drop missing Clang flags (c1897ca)
• Fix: Mark unused variables (e089fe4)
• Fix: Unknown GCC pragmas on Clang (5980d6d)
• Fix: ABI compat warning for Windows (4c60177)
• Make: Harden builds (b518946)
• Fix: Unused ebx, edx (48734dc)