Make test-spec on Windows silent a little

Merged: https://github.com/ruby/ruby/pull/8210

.appveyor.yml

@@ -103,7 +103,7 @@ for:
     # separately execute tests without -j which may crash worker with -j.
     - >-
       nmake -l
-      "TESTOPTS=-v --timeout-scale=3.0 --excludes=../test/excludes/_appveyor"
+      "TESTOPTS=--timeout-scale=3.0 --excludes=../test/excludes/_appveyor"
       TESTS="
       ../test/win32ole
       ../test/ruby/test_bignum.rb
@@ -111,7 +111,7 @@ for:
       ../test/open-uri/test_open-uri.rb
       ../test/rubygems/test_bundled_ca.rb
       " test-all
-    - nmake -l test-spec MSPECOPT=-fs # not using `-j` because sometimes `mspec -j` silently dies on Windows
+    - nmake -l test-spec # not using `-j` because sometimes `mspec -j` silently dies on Windows
 notifications:
   - provider: Webhook
     method: POST

.github/workflows/windows.yml

@@ -129,8 +129,10 @@ jobs:
           :vcset
           set | C:\msys64\usr\bin\sort > old.env
           call %VCVARS%
+          nmake -f nul
           set TMP=%USERPROFILE%\AppData\Local\Temp
           set TEMP=%USERPROFILE%\AppData\Local\Temp
+          set MAKEFLAGS=l
           set /a TEST_JOBS=(15 * %NUMBER_OF_PROCESSORS% / 10) > nul
           set | C:\msys64\usr\bin\sort > new.env
           C:\msys64\usr\bin\comm -13 old.env new.env >> %GITHUB_ENV%
@@ -162,7 +164,7 @@ jobs:
       - run: nmake test
         timeout-minutes: 5
 
-      - run: nmake test-spec MSPECOPT="-V -fspec"
+      - run: nmake test-spec
         timeout-minutes: 10
 
       - run: nmake test-all