[Cin] How to add correctly BC_TumbleTextBox ?

[Andrew Randrianasulu]

I tried to add png compression level into filepng.c

But I did something stupid, and whole thing doesn't compile:

root at slax:/dev/shm/tmp/cinelerra-goodguy-20200316/cinelerra-5.1/cinelerra# LANG=C make
g++ `cat i686/c_flags`  -DMSGQUAL=filepng -c filepng.C -o i686/filepng.o
filepng.C: In member function 'virtual void PNGConfigVideo::create_objects()':
filepng.C:370:49: error: no matching function for call to 'PNGConfigVideo::add_subwindow(PNGCompression*)'
  add_subwindow(new PNGCompression(this, x+50, y));
                                                 ^
In file included from /dev/shm/tmp/cinelerra-goodguy-20200316/cinelerra-5.1/cinelerra/../guicast/bcsubwindow.h:26:0,
                 from /dev/shm/tmp/cinelerra-goodguy-20200316/cinelerra-5.1/cinelerra/../guicast/bcbar.h:26,
                 from /dev/shm/tmp/cinelerra-goodguy-20200316/cinelerra-5.1/cinelerra/../guicast/guicast.h:27,
                 from edit.h:30,
                 from filepng.C:23:
/dev/shm/tmp/cinelerra-goodguy-20200316/cinelerra-5.1/cinelerra/../guicast/bcwindowbase.h:276:17: note: candidate: BC_WindowBase* BC_WindowBase::add_subwindow(BC_WindowBase*)
  BC_WindowBase* add_subwindow(BC_WindowBase *subwindow);
                 ^
/dev/shm/tmp/cinelerra-goodguy-20200316/cinelerra-5.1/cinelerra/../guicast/bcwindowbase.h:276:17: note:   no known conversion for argument 1 from 'PNGCompression*' to 'BC_WindowBase*'
At global scope:
cc1plus: warning: unrecognized command line option '-Wno-stringop-truncation'
cc1plus: warning: unrecognized command line option '-Wno-format-overflow'
cc1plus: warning: unrecognized command line option '-Wno-format-truncation'
cc1plus: warning: unrecognized command line option '-Wno-stringop-overflow'
cc1plus: warning: unrecognized command line option '-Wno-unknown-warning-option'
make: *** [i686/filepng.o] Error 1

patch attached ....
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