audio/liblastfm-qt5: Fix build with Clang >= 16

In file included from /wrkdirs/usr/ports/audio/liblastfm-qt5/work/liblastfm-1.0.9-5-g4433165/src/fingerprint/Fingerprint.cpp:21:
/wrkdirs/usr/ports/audio/liblastfm-qt5/work/liblastfm-1.0.9-5-g4433165/src/fingerprint/Fingerprint.h:74:49: error: ISO C++17 does not allow dynamic exception specifications [-Wdynamic-exception-spec]

void generate( FingerprintableSource* ) throw( Error );

While here, pet portlint (1).

Reported by: pkg-fallout