CI: Don't fail check-symbols if symbol is defiend somewhere else

Meta/check-symbols.sh

@@ -11,8 +11,12 @@ cd "$script_path/.." || exit 1
 FORBIDDEN_SYMBOLS="__cxa_guard_acquire __cxa_guard_release"
 LIBC_PATH="Build/Userland/Libraries/LibC/libc.a"
 for forbidden_symbol in $FORBIDDEN_SYMBOLS; do
- # check if symbol is undefined
- if nm $LIBC_PATH | grep "U $forbidden_symbol" ; then
+ # check if there's an undefined reference to the symbol & it is not defined anywhere else in the library
+ nm $LIBC_PATH | grep "U $forbidden_symbol"
+ APPEARS_AS_UNDEFINED=$?
+ nm $LIBC_PATH | grep "T $forbidden_symbol"
+ APPEARS_AS_DEFINED=$?
+ if [ $APPEARS_AS_UNDEFINED -eq 0 ] && [ ! $APPEARS_AS_DEFINED -eq 0 ]; then
  echo "Forbidden undefined symbol in LibC: $forbidden_symbol"
  echo "See comment in Meta/check-symbols.sh for more info"
  exit 1