gitlab#178 - rsvg-test.c: On 32-bit, allow the maximum difference between color channels to be 10
gitlab#178 - rsvg-test.c: On 32-bit, allow the maximum difference between color channels to be 10

This is kind of a lousy reason, but i386 is getting max differences of
9 in some text-rendering cases, with respect to the reference files
generated on x86_64.

An explanation of different floating-point units and how i386 uses
80-bit extended precision for everything (by default, at least), while
x86_64 uses different precisions depending on the instructions:

https://stackoverflow.com/questions/22710272/difference-in-floating-point-arithmetics-between-x86-and-x64#22711132

This is more or less a hack, but it will do for now.

https://gitlab.gnome.org/GNOME/librsvg/issues/178

GNOME/librsvg,GNOME/librsvg,GNOME/librsvg,GNOME/librsvg