patch 8.0.1472: MS-Windows: nsis installer is a bit slow

Problem:    MS-Windows: nsis installer is a bit slow.
Solution:   Use ReserveFile for vimrc.ini. (closes #2522)

nsis/gvim.nsi

@@ -89,6 +89,11 @@ Page instfiles
 UninstPage uninstConfirm
 UninstPage instfiles
 
+# Reserve files
+# Needed for showing the _vimrc setting page faster.
+ReserveFile /plugin InstallOptions.dll
+ReserveFile vimrc.ini
+
 ##########################################################
 # Functions
 
@@ -475,14 +480,12 @@ Function SetCustom
 	# Display the InstallOptions dialog
 
 	# Check if a _vimrc should be created
-	SectionGetFlags ${sec_vimrc_id} $0
-	IntOp $0 $0 & 1
-	StrCmp $0 "1" +2 0
+	SectionGetFlags ${sec_vimrc_id} $3
+	IntOp $3 $3 & 1
+	StrCmp $3 "1" +2 0
 	  Abort
 
-	Push $3
-	  InstallOptions::dialog "$PLUGINSDIR\vimrc.ini"
-	  Pop $3
+	InstallOptions::dialog "$PLUGINSDIR\vimrc.ini"
 	Pop $3
 FunctionEnd
 

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1472,
 /**/
     1471,
 /**/