Fix for check_icmp build on Solaris from Andreas Ericsson <ae@op5.se>

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1140 f882894a-f735-0410-b71e-b25c423dba1c

plugins/Makefile.am

@@ -54,7 +54,7 @@ check_fping_LDADD = $(NETLIBS) popen.o
 check_game_LDADD = $(BASEOBJS) popen.o
 check_http_LDADD = $(NETLIBS) $(SSLLIBS)
 check_hpjd_LDADD = $(NETLIBS) popen.o
-check_icmp_LDADD = 
+check_icmp_LDADD = $(SOCKETLIBS)
 check_ldap_LDADD = $(NETLIBS) $(LDAPLIBS)
 check_load_LDADD = $(BASEOBJS) popen.o
 check_mrtg_LDADD = $(BASEOBJS)