Naive concatenation of $LD_LIBRARY_PATH can result in an empty
colon-delimited segment; this tells glibc to load libraries from the
current directory, which is definitely wrong, and may be a security
vulnerability if the current directory is untrusted. (See #67234, for
example.) Fix this throughout the tree.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Cutelyst misses `pcre.h` to compile, adding `pkgs.pcre` as build input
fixes the compilation.
This unbreaks `virtlyst` and the corresponding module as well.
See also https://hydra.nixos.org/build/86293236
