crystfel: fix build with gcc 15 (#503231)

      in

      ''

        cp ${mesonPatch}/meson.build .

        substituteInPlace ccp4/library_utils.c \

          --replace-fail "  int putenv ();" "  int putenv (char *);"

      '';

  };

  # This is the statically-linked, pre-built binary of mosflm. Compiling it ourselves turns out to be very difficult