MINOR: log: make MAX_SYSLOG_LEN overridable at build time

This value was set in log.h without any #ifndef around, so when one
wanted to change it, a patch was needed. Let's move it to defaults.h
with the usual #ifndef so that it's easier to change it.
(cherry picked from commit 4e957907aa117c07214ab84ba2a58f2fc1666931)
2 files changed