New issue by michalszmidt on void-packages repository

https://github.com/void-linux/void-packages/issues/47761

Description:
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```ini
# Templaet file for Koi

pkgname=Koi
version=0.2.4
revision=1
build_style=cmake
configure_args="-DCMAKE_INSTALL_PREFIX=/usr"
hostmakedepends="pkg-config"
makedepends="extra-cmake-modules kcoreaddons-devel qt5-core qt5-dbus qt5-test qt5-core qt5-network kwidgetsaddons-devel hicolor-icon-theme kpackage-devel kcoreaddons-devel kconfig-devel desktop-file-utils fdupes"
short_desc="Switch between light and dark themes on KDE Plasma"
maintainer="Michał Szmidt <michal.sz@disroot.org>"
license="LGPL-3.0"
homepage="https://github.com/baduhai/Koi"
distfiles="https://github.com/baduhai/Koi/archive/refs/tags/${version}.tar.gz"
checksum=e8c976f4f635bed614124fa6afb8853cc9669ec9132c16b140cc64fb4be0166b
```

[This cmake project](https://github.com/baduhai/Koi) has CMakeLists.txt in the src subdir of the git repo, I opened issue addressing it.

https://github.com/baduhai/Koi/issues/77

I could not find any way to make xbps-src handle it correctly

I have tried:
1. According to https://github.com/void-linux/void-packages/issues/20878 I've set up `build_wrksrc` var. It ended with error `could not enter build_wrksrc`. This is weird as when I did `ls -lah` in there `src/` has been deleted (dunno what phase it was).
2. Trying to `mv src/* .` with similar issue of `src/` subdir being deleted in some previous stage.

Does cmake build style delete subdirs from git top tree?