FindBoost: Add support for Boost 1.80

Update the list of known versions.

Run the command

    cmake -DBOOST_DIR=/path/to/boost_1_80_0 \
      -P Utilities/Scripts/BoostScanDeps.cmake

to extract dependencies from the 1.80.0 source tree.
They are the same as 1.79's dependencies, so just update
the version check for warning about newer versions.
diff --git a/Modules/FindBoost.cmake b/Modules/FindBoost.cmake
index 0f407c8..0cea239 100644
--- a/Modules/FindBoost.cmake
+++ b/Modules/FindBoost.cmake
@@ -1380,7 +1380,7 @@
       set(_Boost_TIMER_DEPENDENCIES chrono)
       set(_Boost_WAVE_DEPENDENCIES filesystem serialization thread chrono atomic)
       set(_Boost_WSERIALIZATION_DEPENDENCIES serialization)
-      if(Boost_VERSION_STRING VERSION_GREATER_EQUAL 1.80.0 AND NOT Boost_NO_WARN_NEW_VERSIONS)
+      if(Boost_VERSION_STRING VERSION_GREATER_EQUAL 1.81.0 AND NOT Boost_NO_WARN_NEW_VERSIONS)
         message(WARNING "New Boost version may have incorrect or missing dependencies and imported targets")
       endif()
     endif()
@@ -1653,7 +1653,7 @@
   # _Boost_COMPONENT_HEADERS.  See the instructions at the top of
   # _Boost_COMPONENT_DEPENDENCIES.
   set(_Boost_KNOWN_VERSIONS ${Boost_ADDITIONAL_VERSIONS}
-    "1.79.0" "1.79"
+    "1.80.0" "1.80" "1.79.0" "1.79"
     "1.78.0" "1.78" "1.77.0" "1.77" "1.76.0" "1.76" "1.75.0" "1.75" "1.74.0" "1.74"
     "1.73.0" "1.73" "1.72.0" "1.72" "1.71.0" "1.71" "1.70.0" "1.70" "1.69.0" "1.69"
     "1.68.0" "1.68" "1.67.0" "1.67" "1.66.0" "1.66" "1.65.1" "1.65.0" "1.65"