Yiyang's original patch for msgpack-cxx-5 adapted to version 6.

--- a/Tensile/Source/lib/CMakeLists.txt
+++ b/Tensile/Source/lib/CMakeLists.txt
@@ -97,7 +97,7 @@ if(TENSILE_USE_LLVM OR TENSILE_USE_MSGPACK)
 endif()
 
 if(TENSILE_USE_MSGPACK)
-    find_package(msgpack REQUIRED)
+    find_package(msgpack-cxx REQUIRED)
     target_compile_definitions(TensileHost PUBLIC -DTENSILE_MSGPACK=1)
 
     if(TARGET msgpackc-cxx)