liblzma: Remove XZ_5.1.1alpha version symbol
Now that the lzma_stream_encoder_mt{,_memusage} symbols are gone on
this branch, liblzma should stop pretending to satisfy dependencies on
XZ_5.1.1alpha.
After this change, programs relying on those symbols will error out
immediately at startup like they are supposed to:
app: liblzma.so.5: version `XZ_5.1.1alpha' not found (required by app)
And your scripts that look for version definition entries with
readelf -s (like RPM’s find-provides) can tell that this copy of
liblzma lacks support for multithreaded encoding.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>