Fix Lua 5.4 compatibility in kaguya.hpp

Some Lua 5.4 builds (e.g., vcpkg) removed LUA_GCSETPAUSE and
LUA_GCSETSTEPMUL constants, replacing them with LUA_GCPPAUSE and
LUA_GCPSTEPMUL. Add conditional defines to handle both cases.

Author: johncarmack1984

include/external/kaguya.hpp

@@ -18,6 +18,15 @@ extern "C" {
 #include <lualib.h>
 }
 
+// Lua 5.4 compatibility: Some builds removed LUA_GCSETPAUSE/LUA_GCSETSTEPMUL
+// Check if old constants exist, otherwise define them using the new names
+#if !defined(LUA_GCSETPAUSE) && defined(LUA_GCPPAUSE)
+#define LUA_GCSETPAUSE LUA_GCPPAUSE
+#endif
+#if !defined(LUA_GCSETSTEPMUL) && defined(LUA_GCPSTEPMUL)
+#define LUA_GCSETSTEPMUL LUA_GCPSTEPMUL
+#endif
+
 #ifndef KAGUYA_USE_CPP11
 #if defined(__cpp_decltype) || __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1800)
 #define KAGUYA_USE_CPP11 1
@@ -12495,7 +12504,7 @@ namespace kaguya
 
 			/// @brief sets arg as the new value for the pause of the collector. Returns the previous value for pause.
 			int steppause(int value) { return lua_gc(state_, LUA_GCSETPAUSE, value); }
-			
+
 			///  @brief sets arg as the new value for the step multiplier of the collector. Returns the previous value for step.
 			int setstepmul(int value) { return lua_gc(state_, LUA_GCSETSTEPMUL, value); }