[NFC] Build libc++ verbosely in the macOS CI

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@358529 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/ci/macos-trunk.sh b/utils/ci/macos-trunk.sh
index 588d6c1..7fb1943 100755
--- a/utils/ci/macos-trunk.sh
+++ b/utils/ci/macos-trunk.sh
@@ -144,8 +144,8 @@
 
 
 echo "@@@ Building libc++.dylib and libc++abi.dylib from sources (just to make sure it works) @@@"
-ninja -C "${LIBCXX_BUILD_DIR}" install-cxx
-ninja -C "${LIBCXXABI_BUILD_DIR}" install-cxxabi
+ninja -C "${LIBCXX_BUILD_DIR}" install-cxx -v
+ninja -C "${LIBCXXABI_BUILD_DIR}" install-cxxabi -v
 echo "@@@@@@"