Fails to build with musl

../../vte-0.54.2/src/widget.cc: In member function 'void vte::platform::Widget::dispose()':
../../vte-0.54.2/src/widget.cc:129:30: error: 'W_EXITCODE' was not declared in this scope
                 int status = W_EXITCODE(0, SIGKILL);
                              ^~~~~~~~~~

W_EXITCODE is a glibc-ism and isn't part of musl.

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