fix: warning move var logtxt[] from log.h to log.c

used -Wall for find warning: 'logtxt' defined but not used [-Wunused-variable]
logtxt should only exist in log.c
every other include of log.h introduce another
logtxt which waste space

lib/log.c

@@ -32,6 +32,7 @@
 #include "log.h"
 
 static unsigned char loglvl = L_NUL;
+static const char *logtxt[] = {"INF","NOT","WAR","ERR","DBG","EBH","EBS","NET"};
 static int logtxtlen = sizeof(logtxt) / sizeof(char*);
 
 static FILE *logfp = NULL;