security/gnutls: fix build with lld 17

Since lld17 the default is to have the LDFLAGS --no-undefined-version
activated by default, which means that versions scripts should not
contain undefined symbols

2 bugs in gnutls:
1/ the configure scripts tests an empty binary against a list of version
symbols, meaning it breaks in configure (hence the activation of
--enable-ld-version-scripts) which means currently provided gnutls
packages are build without version scripts which breaks existing
installations...
2/ the version script used to link the binary can contain undefined
symbols depending on the options used to build (hence the addition of
the LDFLAGS.