Another possibility would be to use suppressions via a file (see manual chapter 7 “Listing suppressions in a file”) or via commandline.
Your suppressions.txt could be
*:/path/to/your/thirdpartylibs/*
Which would exclude all errors from that path. The syntax is
[error id]:[filename]:[line]
with wildcard support for * (multiple characters) and ? (single character).
The call to cppcheck would then be
cppcheck --suppressions-list=suppressions.txt .