Defines starting with `c' in src/slirp

• __COMMON_H__ src/slirp/slirp.h:2
• CONFIG_QEMU src/slirp/slirp.h:4
• CTL_ALIAS src/slirp/ctl.h:3
• CTL_CMD src/slirp/ctl.h:1
• CTL_DNS src/slirp/ctl.h:4
• CTL_EXEC src/slirp/ctl.h:2
• CTL_LOCAL src/slirp/ctl.h:7
• CTL_SPECIAL src/slirp/ctl.h:6