configure: fix build problems with eCos

Various include files require some other include files
to be included first. Copied solution from net/if.h.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

configure.in

@@ -35,27 +35,78 @@ AC_TYPE_LONG_LONG_INT
 AC_SEARCH_LIBS([ioperm], [ioperm])
 AC_SEARCH_LIBS([dlopen], [dl])
 
-AC_CHECK_HEADERS(arpa/inet.h)
+AC_CHECK_HEADERS(sys/socket.h)
+AC_CHECK_HEADERS(arpa/inet.h, [], [], [dnl
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+])
 AC_CHECK_HEADERS(elf.h)
 AC_CHECK_HEADERS(dirent.h)
 AC_CHECK_HEADERS(fcntl.h)
-AC_CHECK_HEADERS(ifaddrs.h)
+AC_CHECK_HEADERS(ifaddrs.h, [], [], [dnl
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+])
 AC_CHECK_HEADERS(malloc.h)
 AC_CHECK_HEADERS(netdb.h)
-AC_CHECK_HEADERS(netinet/in.h)
-AC_CHECK_HEADERS(netinet/tcp.h)
+AC_CHECK_HEADERS([netinet/in.h], [], [], [dnl
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+])
+AC_CHECK_HEADERS(netinet/tcp.h, [], [], [dnl
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+])
 AC_CHECK_HEADERS(pthread.h)
 AC_CHECK_HEADERS(strings.h)
 AC_CHECK_HEADERS(sys/ioctl.h)
 AC_CHECK_HEADERS(sys/param.h)
 AC_CHECK_HEADERS(sys/poll.h)
 AC_CHECK_HEADERS(sys/select.h)
-AC_CHECK_HEADERS(sys/socket.h)
 AC_CHECK_HEADERS(sys/stat.h)
 AC_CHECK_HEADERS(sys/time.h)
 AC_CHECK_HEADERS(sys/types.h)
 AC_CHECK_HEADERS(unistd.h)
-
 AC_CHECK_HEADERS([net/if.h], [], [], [dnl
 #include <stdio.h>
 #ifdef STDC_HEADERS