New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/40307#discussion_r1012398085

Comment:
> `-DCMAKE_INSTALL_INCLUDEDIR='include/$pkgname'`

this is the [default already](https://github.com/3MFConsortium/lib3mf/blob/v2.2.0/CMakeLists.txt#L23)

> `-DCMAKE_INSTALL_PREFIX=/usr`

this is [already specified](https://github.com/void-linux/void-packages/blob/master/common/build-style/cmake.sh#L54)