build: Fix .rc generation in Meson builds
build: Fix .rc generation in Meson builds

We need to specify the value for the ATK_VERSION variable as well,
otherwise some version info of the DLL will not be set correctly.

https://bugzilla.gnome.org/show_bug.cgi?id=785802

GNOME/at-spi2-core,GNOME/at-spi2-core,GNOME/at-spi2-core