Kate: mention Ninja Multiconfig in the docs

Help/generator/Kate.rst

@@ -28,5 +28,8 @@ This "extra" generator may be specified as:
 ``Kate - Ninja``
  Generate with :generator:`Ninja`.
 
+``Kate - Ninja Multi-Config``
+ Generate with :generator:`Ninja Multi-Config`.
+
 ``Kate - Unix Makefiles``
  Generate with :generator:`Unix Makefiles`.

Source/cmExtraKateGenerator.h

@@ -5,6 +5,7 @@
 #include "cmConfigure.h" // IWYU pragma: keep
 
 #include <string>
+#include <vector>
 
 #include "cmExternalMakefileProjectGenerator.h"