fix test and example

Author: odygrd

include/quill/MacroFree.h

@@ -14,8 +14,10 @@
 #if QUILL_CPLUSPLUS >= 202002L
   #if QUILL_HAS_INCLUDE(<source_location>)
     #include <source_location>
+    #define QUILL_HAS_SOURCE_LOCATION 1
   #elif QUILL_HAS_INCLUDE(<experimental/source_location>)
     #include <experimental/source_location>
+    #define QUILL_HAS_EXPERIMENTAL_SOURCE_LOCATION 1
   #else
     #error                                                                                         \
       "MacroFree header requires <source_location> or <experimental/source_location> to be available"
@@ -29,13 +31,11 @@
 
 QUILL_BEGIN_NAMESPACE
 
-// clang-format off
-#if QUILL_HAS_INCLUDE(<source_location>)
-  using source_location_t = std::source_location;
-#elif QUILL_HAS_INCLUDE(<experimental/source_location>)
-  using source_location_t = std::experimental::source_location;
+#if defined(QUILL_HAS_SOURCE_LOCATION)
+using source_location_t = std::source_location;
+#elif defined(QUILL_HAS_EXPERIMENTAL_SOURCE_LOCATION)
+using source_location_t = std::experimental::source_location;
 #endif
-// clang-format on
 
 /**
  * Tag structure for log messages