FindRuby: Add support for versions 2.2, 2.3, and 2.4

Author: J. Peter Mugaas (jpmugaas on gitlab.kitware.com)
Fixes: #17475

Modules/FindRuby.cmake

@@ -59,6 +59,9 @@ else()
 endif()
 
 if(NOT Ruby_FIND_VERSION_EXACT)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.4 ruby24)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.3 ruby23)
+  list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.2 ruby22)
   list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.1 ruby21)
   list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby2.0 ruby20)
   list(APPEND _RUBY_POSSIBLE_EXECUTABLE_NAMES ruby1.9 ruby19)
@@ -170,6 +173,21 @@ if(RUBY_EXECUTABLE AND NOT RUBY_VERSION_MAJOR)
       set(RUBY_VERSION_MAJOR 2)
       set(RUBY_VERSION_MINOR 1)
    endif()
+   # check whether we found 2.2.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?2")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 2)
+   endif()
+   # check whether we found 2.3.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?3")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 3)
+   endif()
+   # check whether we found 2.4.x
+   if(${RUBY_EXECUTABLE} MATCHES "ruby2\\.?4")
+      set(RUBY_VERSION_MAJOR 2)
+      set(RUBY_VERSION_MINOR 4)
+   endif()
 endif()
 
 if(RUBY_VERSION_MAJOR)