New comment by pullmoll on void-packages repository

https://github.com/void-linux/void-packages/pull/25753#issuecomment-713228636

Comment:
In `srcpkgs/ccache/template` add the following lines to fix cross builds:
```
if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
        makedepends+=" libatomic-devel"
fi

pre_configure() {
        if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
                vsed -i src/CMakeLists.txt \
                        -e "/add_library/a target_link_libraries(ccache_lib PRIVATE atomic)"
        fi
}
```