patch 8.2.4222: MS-Windows: clumsy way to suppress progress on CI

Problem:    MS-Windows: clumsy way to suppress progress on CI.
Solution:   Check for "$CI" in the Makefile itself. (Ken Takata, closes #9631)
diff --git a/ci/appveyor.bat b/ci/appveyor.bat
index 5d5a9f1..92ec936 100644
--- a/ci/appveyor.bat
+++ b/ci/appveyor.bat
@@ -5,11 +5,9 @@
 cd %APPVEYOR_BUILD_FOLDER%
 
 cd src
-:: Filter out the progress bar from the build log
-sed -e "s/@<<$/@<< | sed -e 's#.*\\\\r.*##'/" Make_mvc.mak > Make_mvc2.mak
 
 echo "Building MSVC 64bit console Version"
-nmake -f Make_mvc2.mak CPU=AMD64 ^
+nmake -f Make_mvc.mak CPU=AMD64 ^
     OLE=no GUI=no IME=yes ICONV=yes DEBUG=no ^
     FEATURES=%FEATURE%
 if not exist vim.exe (
@@ -21,13 +19,13 @@
 :: GUI needs to be last, so that testing works
 echo "Building MSVC 64bit GUI Version"
 if "%FEATURE%" == "HUGE" (
-    nmake -f Make_mvc2.mak CPU=AMD64 ^
+    nmake -f Make_mvc.mak CPU=AMD64 ^
         OLE=no GUI=yes IME=yes ICONV=yes DEBUG=no POSTSCRIPT=yes ^
         PYTHON_VER=27 DYNAMIC_PYTHON=yes PYTHON=C:\Python27-x64 ^
         PYTHON3_VER=35 DYNAMIC_PYTHON3=yes PYTHON3=C:\Python35-x64 ^
         FEATURES=%FEATURE%
 ) ELSE (
-    nmake -f Make_mvc2.mak CPU=AMD64 ^
+    nmake -f Make_mvc.mak CPU=AMD64 ^
         OLE=no GUI=yes IME=yes ICONV=yes DEBUG=no ^
         FEATURES=%FEATURE%
 )