patch 9.1.0527: inconsistent parameter in Makefiles for Vim executable

Problem:  inconsistent parameter in Makefiles for Vim executable
Solution: consistently use $VIMPROG across all Makefiles
          (RestorerZ)

closes: #15099

Signed-off-by: RestorerZ <restorer@mail2k.ru>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/Make_mvc.mak b/runtime/doc/Make_mvc.mak
index f2fbc52..c387ef8 100644
--- a/runtime/doc/Make_mvc.mak
+++ b/runtime/doc/Make_mvc.mak
@@ -12,7 +12,7 @@
 
 # Correct the following line for the where executeable file vim is installed.
 # Please do not put the path in quotes.
-VIMEXE = D:\Programs\Vim\vim90\vim.exe
+VIMPROG = D:\Programs\Vim\vim90\vim.exe
 
 # Correct the following line for the directory where iconv installed.
 # Please do not put the path in quotes.
@@ -63,7 +63,7 @@
 # Use Vim to generate the tags file.  Can only be used when Vim has been
 # compiled and installed.  Supports multiple languages.
 vimtags : $(DOCS)
-	@"$(VIMEXE)" --clean -esX -V1 -u doctags.vim
+	@"$(VIMPROG)" --clean -esX -V1 -u doctags.vim
 
 
 uganda.nsis.txt : uganda.???
@@ -105,7 +105,7 @@
 
 # Check URLs in the help with "curl" or "powershell".
 test_urls :
-	"$(VIMEXE)" --clean -S test_urls.vim
+	"$(VIMPROG)" --clean -S test_urls.vim
 
 clean :
 	$(RM) doctags.exe doctags.obj
diff --git a/runtime/doc/Makefile b/runtime/doc/Makefile
index 30a4f08..5f0786d 100644
--- a/runtime/doc/Makefile
+++ b/runtime/doc/Makefile
@@ -7,7 +7,7 @@
 AWK = awk
 
 # Set to $(VIMTARGET) when executed from src/Makefile.
-VIMEXE = vim
+VIMPROG = vim
 
 # include the config.mk from the source directory.  It's only needed to set
 # AWK, used for "make html".  Comment this out if the include gives problems.
@@ -25,7 +25,7 @@
 # Use Vim to generate the tags file.  Can only be used when Vim has been
 # compiled and installed.  Supports multiple languages.
 vimtags: $(DOCS)
-	@$(VIMEXE) --clean -esX -V1 -u doctags.vim
+	@$(VIMPROG) --clean -esX -V1 -u doctags.vim
 
 # Use "doctags" to generate the tags file.  Only works for English!
 tags: doctags $(DOCS)
@@ -57,7 +57,7 @@
             $${dpn} | uniq > $${trg%txt}$${dpn##*.}; \
 	done
 # This files needs to be in dos fileformat for NSIS.
-	$(VIMEXE) -e -X -u NONE --cmd "set notitle noicon nocp noml viminfo=" \
+	$(VIMPROG) -e -X -u NONE --cmd "set notitle noicon nocp noml viminfo=" \
 	  -c "argdo write ++ff=dos" -c "qa" uganda.nsis.???
 
 # Awk version of .txt to .html conversion.
@@ -91,7 +91,7 @@
 
 # Check URLs in the help with "curl".
 test_urls:
-	$(VIMEXE) --clean -S test_urls.vim
+	$(VIMPROG) --clean -S test_urls.vim
 
 clean:
 	-rm -f doctags *.html tags.ref