bootstrap: Fix compilation with gcc 16 devirtualization

Avoid including a header for a subclass whose implementation is not
compiled during bootstrap.

Fixes: #27256

Source/cmake.cxx

@@ -125,12 +125,12 @@
 #  include "cmExtraEclipseCDT4Generator.h"
 #  include "cmExtraKateGenerator.h"
 #  include "cmExtraSublimeTextGenerator.h"
-#endif
 
 // NOTE: the __linux__ macro is predefined on Android host too, but
 // main CMakeLists.txt filters out this generator by host name.
-#if (defined(__linux__) && !defined(__ANDROID__)) || defined(_WIN32)
-#  include "cmGlobalGhsMultiGenerator.h"
+#  if (defined(__linux__) && !defined(__ANDROID__)) || defined(_WIN32)
+#    include "cmGlobalGhsMultiGenerator.h"
+#  endif
 #endif
 
 #if defined(__APPLE__)