* r2pm/meson.build: install r2pm
* meson.build: use system libraries when available
* travis: add fedora-sys to the list of things to test
* bin_nso.c: still include lz4.c when not on meson
* Dockerfile.travis: add required system dependencies to dockerfile
* meson.build: split zip_dep in libzip and zlib dependencies
* shlr/meson.build: zip needs zlib