mbuf: Use SLIRP_DEBUG to enable mbuf debugging instead of DEBUG
DEBUG is set by a number of IDEs and development environments (cough xcode cough). This means we use mbuf duplication when we don't need (or expect) it. Change the name to SLIRP_DEBUG to enable this feature.
Signed-off-by: Pablo Fiori pablofiori@fb.com Signed-off-by: Brett Nash nash@fb.com