patch 8.2.0100: macros for Ruby are too complicated

Problem:    Macros for Ruby are too complicated.
Solution:   Do not use DYNAMIC_RUBY_VER, use RUBY_VERSION. (Ken Takata,
            closes #5452)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index 8694f74..eb71296 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -1193,10 +1193,11 @@
 # Do we want to load Ruby dynamically?
 ! if "$(DYNAMIC_RUBY)" == "yes"
 !  message Ruby DLL will be loaded dynamically
-CFLAGS = $(CFLAGS) -DDYNAMIC_RUBY -DDYNAMIC_RUBY_VER=$(RUBY_VER) \
-		-DDYNAMIC_RUBY_DLL=\"$(RUBY_INSTALL_NAME).dll\" 
+CFLAGS = $(CFLAGS) -DDYNAMIC_RUBY \
+		-DDYNAMIC_RUBY_DLL=\"$(RUBY_INSTALL_NAME).dll\"
 !  undef RUBY_LIB
 ! endif
+CFLAGS = $(CFLAGS) -DRUBY_VERSION=$(RUBY_VER)
 !endif # RUBY
 
 #