Bug#853674: synfig: ftbfs with GCC-7

[Adrian Bunk]

Control: reassign -1 etl-dev
Control: reassign 853675 etl-dev
Control: forcemerge -1 853675
Control: retitle -1 etl-dev: /usr/include/ETL/_surface.h error with gcc 7
Control: affects -1 src:synfig src:synfigstudio

The actual error message is:

...
In file included from /usr/include/ETL/surface:32:0,
                 from surface.h:34,
                 from context.h:34,
                 from target_cairo_tile.cpp:37:
/usr/include/ETL/_surface.h: In member function 'void etl::surface<T, AT, VP>::swap(const etl::surface<T, AT, VP>&)':
/usr/include/ETL/_surface.h:95:20: error: no matching function for call to 'swap(int&, const int&)'
   std::swap(w_,x.w_);
                    ^
...


This is a bug in etl-dev that is also visible during src:etl build [1].

cu
Adrian

[1] https://tests.reproducible-builds.org/debian/rbuild/unstable/amd64/etl_0.04.19-1.rbuild.log

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       "Is there not promise of rain?" Ling Tan asked suddenly out
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       "Only a promise," Lao Er said.
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