[Perl] Static linker fix on Linux

[Akkadius]

Perl wasn't fully linking in static binaries. We use these in our release binaries (portable)

Before

After

-- * Perl:                                    FOUND *
-- * libsodium:                               FOUND *

Problem(s)

Perl Cmake module does not know where to find the .a (static archive) so PERL_LIBRARY is used to supply to the FindPerlLibs cmake module to look for the perl module instead of the /usr/lib paths

Afterwards, we have a linker error because the archive does not have a symbol to a libcrypt function, thus we link to the static archive of libcrypt

/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libperl.a(pp.o): in function `Perl_pp_crypt':
(.text+0xb364): undefined reference to `crypt_r'
collect2: error: ld returned 1 exit status