Fixes some new warnings under clang-15 - -Wdeprecated-non-prototype /src/le/libevent/strlcpy.c:48:1: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype] event_strlcpy_(dst, src, siz) - -Wstrict-prototypes /src/le/libevent/evthread.c:82:70: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes] struct evthread_condition_callbacks *evthread_get_condition_callbacks() - -Wunused-but-set-variable /src/le/libevent/test/regress_buffer.c:130:6: warning: variable 'n' set but not used [-Wunused-but-set-variable] int n = 0; ^