[libphobos, build] Enable libphobos on Solaris 11/x86

[Rainer Orth]

With the set of libphobos Solaris patches just posted, it would become
possible to enable libphobos on Solaris 11/x86 by default.

This is what this patch does.  

* It uses a LIBPHOBOS_SUPPORTED variable both in toplevel configure and
  libphobos/configure.tgt, following what libvtv does.

* It's necessary to disable libphobos when Solaris as is in use: it has
  a relatively low line length limit of 10240 which is exceeded in a few
  libphobos files.

Bootstrapped without regressions on i386-pc-solaris2.11 (as and gas, gas
and gld, Solaris 11.3/11.4/11.5) on top of the previous set of patches.

Also tested manually that explicit
--enable-libphobos/--disable-libphobos give the desired results
(i.e. override the defaults).

	Rainer

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


2019-01-23  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	toplevel:
	* configure.ac (enable_libphobos): Check LIBPHOBOS_SUPPORTED.
	* configure: Regenerate.

	libphobos:
	* configure.tgt (LIBPHOBOS_SUPPORTED): Default to no.
	Set to yes explicitly.
	(x86_64-*-solaris2.11* | i?86-*-solaris2.11*): Mark supported.
	* configure.ac (x86_64-*-solaris2.* | i?86-*-solaris2.*): Only
	mark supported with gas.
	(ENABLE_LIBPHOBOS): New conditional.
	* configure: Regenerate.
	* Makefile.am (SUBDIRS): Only set if ENABLE_LIBPHOBOS.
	* Makefile.in: Regenerate.

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