gcc emits build warnings for misleading indentation

[alokpr]

Build fails with -Wall -Werror:

flann/util/any.h: In member function 'virtual void flann::anyimpl::big_any_policy<T>::static_delete(void**)':
flann/util/any.h:81:9: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
   81 |         if (* x) delete (* reinterpret_cast<T**>(x)); *x = NULL;
      |         ^~
flann/util/any.h:81:55: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   81 |         if (* x) delete (* reinterpret_cast<T**>(x)); *x = NULL;
      |                                                       ^