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With the siwtch to a C++ compiler, the AC_PATH_XTRA has become less
effective as it internally relies on the C compiler invokation. Fixed
CXXFLAGS, CPPFLAGS, and LDFLAGS when detecting <X11/xpm.h> usability.
Various bitmasks in src/hyper and src/graph were bogusly using 'char'
(instead of 'unsigned char') when they specify values larger than 127.
Caught by the C++ compiler, thanks to no-narrowing conversion. Fixed.
Eventually the X11-based HD interface and graphics should be replaced
by a more modern GUI interface.
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