Expand LUA_FUNCTION macro and remove its definition

[Copilot]

This PR addresses the requirement to expand the LUA_FUNCTION macro throughout the codebase and remove its definition entirely.

Changes Made

The LUA_FUNCTION(X) macro was defined as:

#define LUA_FUNCTION(X) int X(lua_State *L)

This PR expands all 258 usages of this macro across the codebase, replacing them with explicit function declarations and definitions:

Before:

static LUA_FUNCTION(openssl_digest_new)
{
    // function body
}

LUA_FUNCTION(luaopen_digest);

After:

static int openssl_digest_new(lua_State *L)
{
    // function body
}

int luaopen_digest(lua_State *L);

Files Modified

• 17 files total updated across the source directory
• Function declarations in src/openssl.h expanded
• Function definitions in 16 source files expanded
• Macro definition completely removed

Verification

• ✅ All code compiles successfully without errors
• ✅ All 117 existing tests continue to pass
• ✅ No LUA_FUNCTION references remain in the codebase
• ✅ Function signatures are now explicit and standard C declarations

The codebase now uses standard C function declarations throughout, improving code clarity and removing the dependency on the custom macro.

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