Fixed Windows/MSVC compilation.

source/mijin/util/os.cpp

@@ -46,6 +46,9 @@ LibraryHandle openSharedLibrary(std::string_view libraryFile) noexcept
     const fs::path libraryPath = fs::absolute(libraryFile);
     return {.data = dlopen(libraryPath.c_str(), RTLD_NOW)};
 #elif MIJIN_TARGET_OS == MIJIN_OS_WINDOWS
+	// TODO
+	(void) libraryFile;
+	return {};
 #endif
 }
 
@@ -54,6 +57,9 @@ void* loadSymbolFromLibrary(const LibraryHandle library, const char* symbolName)
 #if MIJIN_TARGET_OS == MIJIN_OS_LINUX
     return dlsym(library.data, symbolName);
 #elif MIJIN_TARGET_OS == MIJIN_OS_WINDOWS
+	(void) library;
+	(void) symbolName;
+	return nullptr;
 #endif
 }
 
@@ -62,6 +68,7 @@ void setCurrentThreadName(const char* threadName) noexcept
 #if MIJIN_TARGET_OS == MIJIN_OS_LINUX
     pthread_setname_np(pthread_self(), threadName);
 #elif MIJIN_TARGET_OS == MIJIN_OS_WINDOWS
+	(void) threadName;
 #endif
 }