Don't output stdout from lld check in init-compiler.sh (#8221)

eng/common/native/init-compiler.sh

@@ -2,6 +2,7 @@
 #
 # This file detects the C/C++ compiler and exports it to the CC/CXX environment variables
 #
+# NOTE: some scripts source this file and rely on stdout being empty, make sure to not output anything here! 
 
 if [[ "$#" -lt 3 ]]; then
   echo "Usage..."
@@ -113,7 +114,7 @@ fi
 
 # Only lld version >= 9 can be considered stable
 if [[ "$compiler" == "clang" && "$majorVersion" -ge 9 ]]; then
-    if "$CC" -fuse-ld=lld -Wl,--version 2>/dev/null; then
+    if "$CC" -fuse-ld=lld -Wl,--version >/dev/null 2>&1; then
         LDFLAGS="-fuse-ld=lld"
     fi
 fi