Defines starting with `p' in src/slirp

• PACK_RESET src/slirp/slirp.h:217
• PRAGMA_PACK_SUPPORTED src/slirp/slirp.h:216
• PR_FASTHZ src/slirp/tcp.h:39
• PRN_SPRINTF src/slirp/slirpdebug.h:9
• PRN_STDERR src/slirp/slirpdebug.h:8
• PROTO_PPP src/slirp/slirpmain.h:51
• PROTO_SLIP src/slirp/slirpmain.h:49
• PR_SLOWHZ src/slirp/tcp.h:38