tests: add a test for basic network syscalls

* tests/.gitignore: Add net-accept-connect, *.o and *.log.*.
* tests/Makefile.am (AM_CFLAGS): New variable.
(check_PROGRAMS): Add net-accept-connect.
(TESTS): Add net.
* tests/net-accept-connect.c: New file.
* tests/net: New file.
4 files changed