More googletest updates

[d-torrance]

A couple small googletest updates to squeeze in before the Macaulay2 1.25.05 release:

• Fetch 1.16 to fix the build with the latest version of cmake
• Include the pthreads flag for proper detection on some systems (e.g., RHEL) in the autotools build

Cc: @mahrud

[mahrud]

It does seem like changing this only in memtailor fixes the issue, but technically mathic and mathicgb also have the same issue (if they were to be built independently).

This is the error btw:

-- Could NOT find GTest (missing: GTEST_LIBRARY GTEST_INCLUDE_DIR GTEST_MAIN_LIBRARY)
CMake Error at BUILD/build/_deps/googletest-src/CMakeLists.txt:4 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

[d-torrance]

Yeah -- I was planning on opening similar PR's in mathic/mathicgb once I got the green light from you for memtailor

[mahrud]

Oh I see. Sorry I already opened those, but if you have other fixes feel free to open your own version and close mine or just push commits to mine.

[d-torrance]

I wasn't able to push to your fork so I opened up PR's with the autotools fix:

mahrud/mathic#1
mahrud/mathicgb#1

[d-torrance]

Do you want to merge those two PR's into yours? Then we can get Mike to merge them all and I'll update the submodules in the release branch

[mahrud]

I don't care either way.

[d-torrance]

Ok -- if you would, go ahead and merge those two. Then your two PR's should get updated automatically

[mahrud]

I don't think I have access to merge.

[mahrud]

Nevermind, I do there, but oddly not here!

[mahrud]

OH LOL the pull requests were onto my forks, sorry I'm not paying attention.

[d-torrance]

@mikestillman - Would you merge this when you get a chance?