Revert "Update fmt to version 6.1.2"

This reverts commit 1f56fc3. Problem is a build problem with clang < 5.0, see fmtlib/fmt#1587 I tried to patch it manually, but am now reverting this until there is a new working release.
simulationcraft · Mar 11, 2020 · 5a095cc · 5a095cc
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diff --git a/engine/util/fmt/README.md b/engine/util/fmt/README.md
@@ -14,5 +14,6 @@ std::string s = fmt::format("{0}{1}{0}", "abra", "cad");
 
 SimC Integration:
 -----------------
-* Release 6.1.2 from https://github.com/fmtlib/fmt/releases/tag/6.1.2
-* rename .cc files to .cpp for simpler integration into our build systems.
+* Release 6.0.0 from https://github.com/fmtlib/fmt/releases/tag/6.0.0
+* rename .cc files to .cpp for simpler integration into our build systems.
+* applied workaround for VS2019 bug: https://github.com/fmtlib/fmt/pull/1328/commits/35658bf42d6fc3eb2b3b5f78f85a0abd8f9b6817