Don't check for epoll support when cross compiling.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@81873 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 78683 .
+# From configure.ac Revision: 79972 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61.
 #
@@ -15624,6 +15624,8 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     fi
 
 
+if test "${cross_compiling}" = "no";
+then
 { echo "$as_me:$LINENO: checking for working epoll support" >&5
 echo $ECHO_N "checking for working epoll support... $ECHO_C" >&6; }
 cat >conftest.$ac_ext <<_ACEOF
@@ -15681,6 +15683,7 @@ fi
 
 rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
       conftest$ac_exeext conftest.$ac_ext
+fi
 
 { echo "$as_me:$LINENO: checking for compiler atomic operations" >&5
 echo $ECHO_N "checking for compiler atomic operations... $ECHO_C" >&6; }

configure.ac

@@ -332,6 +332,8 @@ fi
 AST_C_DEFINE_CHECK([PTHREAD_RWLOCK_INITIALIZER], [PTHREAD_RWLOCK_INITIALIZER], [pthread.h])
 AST_C_DEFINE_CHECK([PTHREAD_RWLOCK_PREFER_WRITER_NP], [PTHREAD_RWLOCK_PREFER_WRITER_NP], [pthread.h])
 
+if test "${cross_compiling}" = "no";
+then
 AC_MSG_CHECKING(for working epoll support)
 AC_LINK_IFELSE(
 AC_LANG_PROGRAM([#include <sys/epoll.h>], [int res = epoll_create(10);
@@ -343,6 +345,7 @@ AC_MSG_RESULT(yes)
 AC_DEFINE([HAVE_EPOLL], 1, [Define to 1 if your system has working epoll support.]),
 AC_MSG_RESULT(no)
 )
+fi
 
 AC_MSG_CHECKING(for compiler atomic operations)
 AC_LINK_IFELSE(