unittest: Ignore _Float128 types in ffi

When building with certain GCC versions, a _Float128 type is present
when setting up the ffi for unit tests.

    ./test/unit/helpers.lua:256: declaration specifier expected near '_Float128' at line 396
    /usr/bin/luajit: /usr/share/lua/5.1/busted/runner.lua:99: attempt to concatenate local 'message' (a table value)
    stack traceback:
    	/usr/share/lua/5.1/busted/runner.lua:99: in function 'fn'
    	/usr/share/lua/5.1/mediator.lua:103: in function 'publish'
    	/usr/share/lua/5.1/busted/modules/helper_loader.lua:21: in function 'helperLoader'
    	/usr/share/lua/5.1/busted/runner.lua:147: in function </usr/share/lua/5.1/busted/runner.lua:11>
    	/usr/bin/busted:3: in main chunk
    	[C]: at 0x004044a0

    CMake Error at /<<PKGBUILDDIR>>/cmake/RunTests.cmake:53 (message):
      Running unit tests failed with error: 1.

Since this is being pulled in by a dependency, not directly used by
nvim, just ignore the type.

Closes #7423

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