Give every header and source a final newline

Fourteen of them ended on the last brace or the closing #endif, which
makes a diff that touches the end of the file rewrite a line it did not
change, and leaves tools that read line by line one line short.

Author: SineStriker

include/stdcorelib/path.h

@@ -76,4 +76,4 @@ namespace stdc {
     /// @}
 }
 
-#endif // STDCORELIB_PATH_H
+#endif // STDCORELIB_PATH_H

include/stdcorelib/platform/windows/stdc_windows.h

@@ -10,4 +10,4 @@
 
 #include <windows.h>
 
-#endif // STDCORELIB_STDC_WINDOWS_H
+#endif // STDCORELIB_STDC_WINDOWS_H

include/stdcorelib/platform/windows/winapi.h

@@ -49,4 +49,4 @@ namespace stdc::winapi {
 
 }
 
-#endif // STDCORELIB_WINAPI_H
+#endif // STDCORELIB_WINAPI_H

include/stdcorelib/platform/windows/winextra.h

@@ -26,4 +26,4 @@ namespace stdc::windows {
     /// @}
 }
 
-#endif // STDCORELIB_WINEXTRA_H
+#endif // STDCORELIB_WINEXTRA_H

include/stdcorelib/stlextra/algorithms.h

@@ -68,4 +68,4 @@ namespace stdc {
     /// @}
 }
 
-#endif // STDCORELIB_ALGORITHMS_H
+#endif // STDCORELIB_ALGORITHMS_H

include/stdcorelib/stlextra/iterator.h

@@ -156,4 +156,4 @@ namespace stdc {
     /// @}
 }
 
-#endif // STDCORELIB_ITERATOR_H
+#endif // STDCORELIB_ITERATOR_H

src/path.cpp

@@ -28,4 +28,4 @@ namespace stdc {
 
     }
 
-}
+}

src/platform/windows/winapi.cpp

@@ -147,4 +147,4 @@ namespace stdc::winapi {
         return res;
     }
 
-}
+}

src/platform/windows/winextra.cpp

@@ -77,4 +77,4 @@ namespace stdc::windows {
         return ft;
     }
 
-}
+}

src/str.cpp

@@ -406,4 +406,4 @@ namespace stdc {
     }
 #endif
 
-}
+}