Enable windows bundled sysdeps.

[stellaraccident]

• Enabled the bundled sysdeps mode by default on Windows, adding the sqlite3 (which was already in common) and zlib libraries.
• I believe this fixes the root cause from Investigate why zlib detection fails in amd-llvm #375 without requiring an LLVM patch:
  • LLVM was expecting the CMake ZLIB package to advertise a loose ZLIB_LIBRARY and ZLIB_INCLUDE_DIRS, but our version was not. This was causing the check_symbol_exists() to fail, even though the package was found.
  • Includes the zlib FORCE_ON change from amd-llvm: actually link with zlib #342 and should supercede the need for that patch.
• Also ports the zlib patch script from bash->python and uses it from both the linux and windows build.
• May need another tweak or two on the Linux side: since I developed this on Windows, I was just eyeballing Linux.

Fixes #375
Supersedes #342

[ScottTodd]

Nice, thanks!

[stellaraccident]

Ugh, looks like an additional windows PIC issue.

[stellaraccident]

Ugh, looks like an additional windows PIC issue.

Fixed that. Need to pull this branch up on Linux tmw and triage that side before landing. Probably a silly tweak needed.

[stellaraccident]

Ugh, looks like an additional windows PIC issue.

Fixed that. Need to pull this branch up on Linux tmw and triage that side before landing. Probably a silly tweak needed.

Ok, that should do it. It is amazing how many ways there are to misspell a one-letter library name.