[Bug target/79671] [7 Regression] mapnik miscompilation on armv7hl since r235622

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79671

--- Comment #80 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
but they use just: "mutable char data;"