patch 8.0.1191: MS-Windows: missing 32 and 64 bit files in installer

Problem:    MS-Windows: missing 32 and 64 bit files in installer.
Solution:   Include both 32 and 64 bit GvimExt and related dll files. Remove
            old Windows code from the installer. (Ken Takata, closes #2144)
diff --git a/Makefile b/Makefile
index 5fa19b5..4cc77e6 100644
--- a/Makefile
+++ b/Makefile
@@ -120,10 +120,14 @@
 #
 # MS-Windows:
 # - Run make on Unix to update the ".mo" files.
-# - Get libintl-8.dll, libiconv-2.dll and libgcc_s_sjlj-1.dll. E.g. from
+# - Get 32 bit libintl-8.dll, libiconv-2.dll and libgcc_s_sjlj-1.dll. E.g. from
 #   https://mlocati.github.io/gettext-iconv-windows/ .
 #   Use the "shared-32.zip file and extract the archive to get the files.
-#   Put them in the top directory, "make dosrt" uses them.
+#   Put them in the gettext32 directory, "make dosrt" uses them.
+# - Get 64 bit libintl-8.dll and libiconv-2.dll. E.g. from
+#   https://mlocati.github.io/gettext-iconv-windows/ .
+#   Use the "shared-64.zip file and extract the archive to get the files.
+#   Put them in the gettext64 directory, "make dosrt" uses them.
 # - > make dossrc
 #   > make dosrt
 #   Unpack dist/vim##rt.zip and dist/vim##src.zip on an MS-Windows PC.
@@ -461,9 +465,13 @@
 		cp $$i dist/vim/$(VIMRTDIR)/lang/$$n/LC_MESSAGES/vim.mo; \
 	      fi \
 	    done
-	cp libintl-8.dll dist/vim/$(VIMRTDIR)/
-	cp libiconv-2.dll dist/vim/$(VIMRTDIR)/
-	cp libgcc_s_sjlj-1.dll dist/vim/$(VIMRTDIR)/
+	mkdir dist/vim/$(VIMRTDIR)/gettext32
+	cp gettext32/libintl-8.dll dist/vim/$(VIMRTDIR)/gettext32/
+	cp gettext32/libiconv-2.dll dist/vim/$(VIMRTDIR)/gettext32/
+	cp gettext32/libgcc_s_sjlj-1.dll dist/vim/$(VIMRTDIR)/gettext32/
+	mkdir dist/vim/$(VIMRTDIR)/gettext64
+	cp gettext64/libintl-8.dll dist/vim/$(VIMRTDIR)/gettext64/
+	cp gettext64/libiconv-2.dll dist/vim/$(VIMRTDIR)/gettext64/
 
 
 # Used before uploading.  Don't delete the AAPDIR/sign files!
@@ -490,7 +498,10 @@
 	cp vimrun.exe dist/vim/$(VIMRTDIR)/vimrun.exe
 	cp installw32.exe dist/vim/$(VIMRTDIR)/install.exe
 	cp uninstalw32.exe dist/vim/$(VIMRTDIR)/uninstal.exe
-	cp gvimext.dll dist/vim/$(VIMRTDIR)/gvimext.dll
+	mkdir dist/vim/$(VIMRTDIR)/GvimExt32
+	cp gvimext.dll dist/vim/$(VIMRTDIR)/GvimExt32/gvimext.dll
+	mkdir dist/vim/$(VIMRTDIR)/GvimExt64
+	cp gvimext64.dll dist/vim/$(VIMRTDIR)/GvimExt64/gvimext.dll
 	cd dist && zip -9 -rD -z gvim$(VERSION).zip vim <$(COMMENT_GVIM)
 	cp gvim.pdb dist/gvim$(VERSION).pdb