Remove lit's --summary flag from buildbots.

The summary flag causes a progress bar to appear and be rewritten using
a curses like interface. This works great for interactive sessions, but
produces line after line of garbage in the logs.

This should cause the logs to be much smaller and more readable.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D159120

Author: EricWF

libcxx/appveyor.yml

@@ -46,7 +46,7 @@ build_script:
   - cmake -G "%GENERATOR%" %CMAKE_OPTIONS%
     "-DCMAKE_BUILD_TYPE=%configuration%"
     "-DLLVM_PATH=C:\projects\deps\llvm"
-    -DLLVM_LIT_ARGS="-sv --show-xfail --show-unsupported"
+    -DLLVM_LIT_ARGS="-v --show-xfail --show-unsupported"
     %APPVEYOR_BUILD_FOLDER%
 
   #############################################################################

libcxx/utils/ci/run-buildbot

@@ -142,7 +142,7 @@ function generate-cmake-base() {
           -DLIBUNWIND_ENABLE_WERROR=YES \
           -DLIBCXX_ENABLE_CLANG_TIDY=${ENABLE_CLANG_TIDY} \
           ${ENABLE_STD_MODULES} \
-          -DLLVM_LIT_ARGS="-sv --show-unsupported --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
+          -DLLVM_LIT_ARGS="-v --show-unsupported --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
           "${@}"
 }