New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/42354#issuecomment-1440268630

Comment:
> cross-compiling any Qt6 qmake package quickly results in something like:
>         make: *** No rule to make target '/usr/libexec/moc', needed by '.moc/main.moc'.  Stop.

That doesn't seems right:
```
$ /usr/lib/qt6/bin/qmake -query                                  
QT_SYSROOT:
QT_INSTALL_PREFIX:/usr
QT_INSTALL_ARCHDATA:/usr/lib/qt6
QT_INSTALL_DATA:/usr/share/qt6
QT_INSTALL_DOCS:/usr/share/qt6/doc
QT_INSTALL_HEADERS:/usr/include/qt6
QT_INSTALL_LIBS:/usr/lib
QT_INSTALL_LIBEXECS:/usr/lib/qt6/libexec
QT_INSTALL_BINS:/usr/lib/qt6/bin
QT_INSTALL_TESTS:/usr/lib/qt6/tests
QT_INSTALL_PLUGINS:/usr/lib/qt6/plugins
QT_INSTALL_QML:/usr/lib/qt6/qml
QT_INSTALL_TRANSLATIONS:/usr/share/qt6/translations
QT_INSTALL_CONFIGURATION:
QT_INSTALL_EXAMPLES:/usr/lib/qt6/examples
QT_INSTALL_DEMOS:/usr/lib/qt6/examples
QT_HOST_PREFIX:/usr
QT_HOST_DATA:/usr/lib/qt6
QT_HOST_BINS:/usr/lib/qt6/bin
QT_HOST_LIBEXECS:/usr/lib/qt6/libexec
QT_HOST_LIBS:/usr/lib
QMAKE_SPEC:linux-g++
QMAKE_XSPEC:linux-g++
QMAKE_VERSION:3.1
QT_VERSION:6.4.2
$ /usr/arm-linux-musleabihf/usr/lib/qt6/bin/qmake -query
QT_SYSROOT:
QT_INSTALL_PREFIX:/usr/arm-linux-musleabihf/usr
QT_INSTALL_ARCHDATA:/usr/arm-linux-musleabihf/usr
QT_INSTALL_DATA:/usr/arm-linux-musleabihf/usr
QT_INSTALL_DOCS:/usr/arm-linux-musleabihf/usr/doc
QT_INSTALL_HEADERS:/usr/arm-linux-musleabihf/usr/include
QT_INSTALL_LIBS:/usr/arm-linux-musleabihf/usr/lib
QT_INSTALL_LIBEXECS:/usr/arm-linux-musleabihf/usr/libexec
QT_INSTALL_BINS:/usr/arm-linux-musleabihf/usr/bin
QT_INSTALL_TESTS:/usr/arm-linux-musleabihf/usr/tests
QT_INSTALL_PLUGINS:/usr/arm-linux-musleabihf/usr/plugins
QT_INSTALL_QML:/usr/arm-linux-musleabihf/usr/qml
QT_INSTALL_TRANSLATIONS:/usr/arm-linux-musleabihf/usr/translations
QT_INSTALL_CONFIGURATION:
QT_INSTALL_EXAMPLES:/usr/arm-linux-musleabihf/usr/examples
QT_INSTALL_DEMOS:/usr/arm-linux-musleabihf/usr/examples
QT_HOST_PREFIX:/usr/arm-linux-musleabihf/usr
QT_HOST_DATA:/usr/arm-linux-musleabihf/usr/lib/qt6
QT_HOST_BINS:/usr/arm-linux-musleabihf/usr/lib/qt6/bin
QT_HOST_LIBEXECS:/usr/arm-linux-musleabihf/usr/lib/qt6/libexec
QT_HOST_LIBS:/usr/arm-linux-musleabihf/usr/lib
QMAKE_SPEC:linux-g++
QMAKE_XSPEC:linux-g++
QMAKE_VERSION:3.1
QT_VERSION:6.4.2
```