Rpcs3: Allow building with more system dependencies

[hcorion]

We are already using upstream libusb and FAudio submodules, it would be nice to be able to dynamically link against the system libraries on linux or BSD, reducing binary bloat.

• [x] libusb
• [ ] FAudio
• [ ] WolfSSL

[jbeich]

Unmodified:

• asmjit
• discord-rpc
• faudio
• glslang
• libusb
• pugixml
• xxhash

Modified by RPCS3:

• cereal
• hidapi
• yaml-cpp

[qarmin]

Compilation of RPCS3 took me only 5 minutes on my machine, but LLVM with SpirV compiled on my machine 15 minutes(This isn't too much, but I need to compile RPCS3 later with Gitlab CI with only one core without caching).
Maybe there is a way to send to upstream LLVM patches, since there are only ~10 different commits?

[kattjevfel]

So RPCS3 now has a USE_SYSTEM_WOLFSSL option, but trying to use that (with wolfssl installed from AUR) I just get this:

CMake Error at 3rdparty/CMakeLists.txt:440 (find_package):
  By not providing "FindWolfSSL.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "WolfSSL", but
  CMake did not find one.

  Could not find a package configuration file provided by "WolfSSL" with any
  of the following names:

    WolfSSLConfig.cmake
    wolfssl-config.cmake

  Add the installation prefix of "WolfSSL" to CMAKE_PREFIX_PATH or set
  "WolfSSL_DIR" to a directory containing one of the above files.  If
  "WolfSSL" provides a separate development package or SDK, be sure it has
  been installed.


-- Configuring incomplete, errors occurred!
See also "/build/rpcs3-git/src/build/CMakeFiles/CMakeOutput.log".
See also "/build/rpcs3-git/src/build/CMakeFiles/CMakeError.log".

And indeed I do not have any WolfSSLConfig.cmake or wolfssl-config.cmake files on my computer, am I supposed to have compiled WolfSSL with cmake? That seems rather weird seeing how they mainly only support autotools.

[hcorion]

Correct, I was planning on upstreaming a WolfSSLConfig.cmake file to WolfSSL, but I haven't had the time yet.