[qt5base] Fix --qpa option handling when linuxfb plugin is deselected

@mirko

I encountered a compilation error for qt5base on the main branch when the qt5base-plugin-platforms-linuxfb package is not selected:

ERROR: No value supplied to command line option 'qpa'.

This stems from the line in package/feed/video/qt5/qt5base/Makefile:

--qpa=$(if $(CONFIG_PACKAGE_qt5base-plugin-platforms-linuxfb),linuxfb,) \

When CONFIG_PACKAGE_qt5base-plugin-platforms-linuxfb is unset, this results in --qpa= being passed, which is an invalid argument.

The fix is to condition the entire option, so it's only included when the plugin is enabled:

$(if $(CONFIG_PACKAGE_qt5base-plugin-platforms-linuxfb),--qpa=linuxfb,) \

This ensures --qpa=linuxfb is only added when necessary.

@mirko, I'm bringing this to your attention as you're familiar with the Qt5 packages.

qt5base: fix multiple build issues and metadata inconsistency

qt5base: fix dependencies and improve packaging resilience

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