[v3, testsuite] Introduce dg-add-options net_ts

[Rainer Orth]

Some of the new Networking TS tests FAIL before Solaris 11.4 like this:

FAIL: experimental/net/internet/address/v4/members.cc (test for excess errors)
Excess errors:
Undefined                       first referenced
 symbol                             in file
inet_ntop                           /var/tmp//ccpcIRXj.o
gai_strerror                        /var/tmp//ccpcIRXj.o
ld: fatal: symbol referencing errors. No output written to ./members.exe
collect2: error: ld returned 1 exit status

This happens because until the socket etc. functions were integrated
into libc in Solaris 11.4, they only lived in libsocket and libnsl.

The following patch fixes this by introducing a new dg-add-options
keyword net_ts (I'm open for suggestions for the name, of course;
networking_ts might be an option, too) and adding the requirement to the
tests involved.

With the patch below, all but one of the tests PASS on
i386-pc-solaris2.10:

FAIL: experimental/net/internet/resolver/ops/lookup.cc execution test

/vol/gcc/src/hg/trunk/local/libstdc++-v3/testsuite/experimental/net/internet/res
olver/ops/lookup.cc:35: void test01(): Assertion '!ec' failed.

The code in question is

  auto addrs = resolv.resolve("localhost", "http", ec);
  VERIFY( !ec );

but "http" is missing from /etc/services before Solaris 11.4.

Ok for mainline?

Btw., one may want to do similarly for the Filesystem TS tests,
introducing dg-add-options fs_ts (or filesystem_ts) instead of repeating
dg-options "-DUSE_FILESYSTEM_TS -lstdc++fs" over and over again.

	Rainer

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University


2018-10-16  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	libstdc++-v3:
	* testsuite/lib/dg-options.exp (add_options_for_net_ts): New proc.
	* testsuite/experimental/net/internet/address/v4/comparisons.cc:
	Add dg-add-options net_ts.
	* testsuite/experimental/net/internet/address/v4/cons.cc: Likewise.
	* testsuite/experimental/net/internet/address/v4/creation.cc: Likewise.
	* testsuite/experimental/net/internet/address/v4/members.cc: Likewise.
	* testsuite/experimental/net/internet/resolver/base.cc: Likewise.
	* testsuite/experimental/net/internet/resolver/ops/lookup.cc: Likewise.
	* testsuite/experimental/net/internet/resolver/ops/reverse.cc: Likewise.

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