Run of lintian-fixes for gmult

Try this locally (using the package):

debcheckout gmult
cd gmult
DEB_UPDATE_CHANGELOG=auto lintian-brush
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      |   ^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/glib-2.0/glib-object.h:36,
                 from TableBox.c:24:
/usr/include/glib-2.0/gobject/gvaluetypes.h:195:23: note: declared here
  195 | gchar                 g_value_get_char          (const GValue *value);
      |                       ^~~~~~~~~~~~~~~~
gcc -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/harfbuzz -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/x86_64-linux-gnu -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -DGETTEXT_PACKAGE=\"gmult\" -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security  -Wl,-z,relro -Wl,-z,defs -o gmult gmult-Canvas.o gmult-CharBox.o gmult-DigitBox.o gmult-GtkMult.o gmult-MultPuzzle.o gmult-TableBox.o -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0  
/usr/bin/ld: gmult-MultPuzzle.o: undefined reference to symbol 'pow@@GLIBC_2.29'
/usr/bin/ld: /lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
make[4]: *** [Makefile:317: gmult] Error 1
make[4]: Leaving directory '/<<PKGBUILDDIR>>/gmult'
make[3]: *** [Makefile:244: all] Error 2
make[3]: Leaving directory '/<<PKGBUILDDIR>>/gmult'
make[2]: *** [Makefile:304: all-recursive] Error 1

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