Don't try to use libgcc-unwind.map with --disable-shared (PR bootstrap/65725)

[Rainer Orth]

When configuring with --disable-shared, Solaris bootstrap with the
system ld fails since libgcc-unwind.map is missing.  This is no wonder,
given that the file is only generated with --enable-shared.  The
following patch, from the PR, fixes this.

Bootstrapped on amd64-pc-solaris2.11, installed on mainline.

There were many unrelated issues, usually occuring on Linux as well as
Solaris, for a --disable-shared configuration, which I'll either fix or
report separately.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University


2018-12-09  Fredrik Nyström  <fredrik@lysator.liu.se>

	PR bootstrap/65725
	* config/sol2.h: Only use libgcc-unwind.map if
	ENABLE_SHARED_LIBGCC.

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