pkgsStatic.gsasl: fix build
GNU libc and Musl libc have different ideas what
strverscmp("UNKNOWN", "2.2.0")
should return. Upstream of gsasl naturally relies on GNU libc behaviour, so I
patch-out this test for musl builds.
According to Musl maintainer, this is bug on musl side.
=> https://www.openwall.com/lists/musl/2022/11/06/2