Workaround for the following error on gradle sync:

 java.nio.file.InvalidPathException: Illegal char <:> at index 68:
  C:\Users\tompr\Development\dolphin\Externals\minizip-ng\minizip-ng\C:\Users\tompr\Development\dolphin\Source\Android\app\.cxx\RelWithDebInfo\3b681gem\arm64-v8a\Externals\zlib-ng\zlib-ng

SAF for save files is a huge can of worms because they're managed in a
more complicated way than asking the user to select an existing file,
so I won't be touching save files for now.

Externals: Fix clashing dependencies

Jit: Use RangeSet for physical_addresses

Previously, SDL would `find_package(libusb)` which would actually overwrite the user preference in the case where both USE_SYSTEM_LIBUSB and USE_SYSTEM_SDL were OFF. This coincidentally also allows SDL to use libusb on Windows.

cURL tries to find ZSTD anyways due to the lack of setting it in CACHE, and for both ZLIB and ZSTD if we had done find_package previously, cURL would still use ZLIB/ZSTD regardless of the set variable.

This also fixes the CMake build on Windows, since it would fail to find our target defined in Externals and would fall back to trying to redefine it, which produces an error.

This is a very small libary, and as I understand it, it was more or less
developed for Dolphin.

This moves the two relevant files from Externals to Common, changes the
namespace to Common, reformats the code, and adds Dolphin copyright
notices. The change in copyright notice and license was approved by
AdmiralCurtiss.