Allow user to choose between static or shared library

src/spdlog.cpp

@@ -1,8 +1,8 @@
 // Copyright(c) 2015-present Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
-#ifndef SPDLOG_STATIC_LIB
-#error Please define SPDLOG_STATIC_LIB to compile this file.
+#ifndef SPDLOG_COMPILED_LIB
+#error Please define SPDLOG_COMPILED_LIB to compile this file.
 #endif
 
 #include <mutex>
@@ -100,4 +100,4 @@ template FMT_API int internal::char_traits<wchar_t>::format_float(wchar_t *, std
 template FMT_API std::wstring internal::vformat<wchar_t>(wstring_view, basic_format_args<wformat_context>);
 FMT_END_NAMESPACE
 
-#endif
+#endif