Initial implementation for re #1202 (PJILB System Information API) for Linux/Unix


git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@3423 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/aconfigure.ac b/aconfigure.ac
index d6bdf57..a8c7444 100644
--- a/aconfigure.ac
+++ b/aconfigure.ac
@@ -185,6 +185,7 @@
 
 AC_CHECK_HEADER(fcntl.h,[AC_DEFINE(PJ_HAS_FCNTL_H,1)])
 AC_CHECK_HEADER(linux/socket.h,[AC_DEFINE(PJ_HAS_LINUX_SOCKET_H,1)])
+AC_CHECK_HEADER(limits.h,[AC_DEFINE(PJ_HAS_LIMITS_H,1)])
 AC_CHECK_HEADER(malloc.h,[AC_DEFINE(PJ_HAS_MALLOC_H,1)])
 AC_CHECK_HEADER(netdb.h,[AC_DEFINE(PJ_HAS_NETDB_H,1)])
 AC_CHECK_HEADER(netinet/in_systm.h,[AC_DEFINE(PJ_HAS_NETINET_IN_SYSTM_H,1)])
@@ -219,6 +220,7 @@
 AC_CHECK_HEADER(sys/types.h,[AC_DEFINE(PJ_HAS_SYS_TYPES_H,1)])
 AC_CHECK_HEADER(sys/filio.h,[AC_DEFINE(PJ_HAS_SYS_FILIO_H,1)])
 AC_CHECK_HEADER(sys/sockio.h,[AC_DEFINE(PJ_HAS_SYS_SOCKIO_H,1)])
+AC_CHECK_HEADER(sys/utsname.h,[AC_DEFINE(PJ_HAS_SYS_UTSNAME_H,1)])
 AC_CHECK_HEADER(time.h,[AC_DEFINE(PJ_HAS_TIME_H,1)])
 AC_CHECK_HEADER(unistd.h,[AC_DEFINE(PJ_HAS_UNISTD_H,1)])
 AC_CHECK_HEADER(winsock.h,[AC_DEFINE(PJ_HAS_WINSOCK_H,1)])