Fixing build warning long int on seqmap.c line 84

[gsnw]

Fixes the following build warning under ARMv6 CPU

Version: fping-5.1
CPU: ARMv6

seqmap.c: In function ‘seqmap_add’:
seqmap.c:84:96: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘long long int’ [-Wformat=]
 ing error: not enough sequence numbers available! (expire_timeout=%ld, host_nr=%d, ping_count=%d, seqmap_next_id=%d)\n",
                                                                   ~~^
                                                                   %lld

[coveralls]

Coverage decreased (-6.6%) to 72.015% when pulling 204cd65 on gsnw:buildwarn/seqmap-c_84-96 into 5d3eee1 on schweikert:develop.