community/libreoffice: build failure with GCC10

libreoffice has been disabled with 2cbc79ff (community/libreoffice: disable, 2020-08-28), because it does not build anymore since the upgrade to GCC10.

/usr/lib/gcc/x86_64-alpine-linux-musl/10.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/build/aports/community/libreoffice/src/libreoffice-7.0.2.2/workdir/CxxObject/sot/source/sdstor/ucbstorage.o: in function `UCBStorage_Impl::Init()':
ucbstorage.cxx:(.text+0x645b): undefined reference to `non-virtual thunk to cppu::WeakImplHelper<com::sun::star::io::XInputStream>::acquire()'

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