[Patch] Fix build warnings for GAS on mips-linux-gnu

[Iain Sandoe]

Hi,

The recent change introducing the itbl-lex-wrapper, produces the following build warnings for a cross from x86-linux-gnu -> mips-linux-gnu:

in file included from ../../src/binutils-mainline/gas/itbl-lex-wrapper.c:4:
../../src/binutils-mainline/gas/../bfd/sysdep.h:123: warning: function declaration isn't a prototype
../../src/binutils-mainline/gas/../bfd/sysdep.h:127: warning: function declaration isn't a prototype
../../src/binutils-mainline/gas/../bfd/sysdep.h:131: warning: function declaration isn't a prototype
../../src/binutils-mainline/gas/../bfd/sysdep.h:135: warning: function declaration isn't a prototype
../../src/binutils-mainline/gas/../bfd/sysdep.h:143: warning: function declaration isn't a prototype
In file included from ../../src/binutils-mainline/gas/as.h:187,

This is because the newly included bfd/sysdep.h tests several HAVE_DECL_xxx which are not provided by the configury in GAS.

The attached patch resolves that.

OK for trunk?
Iain

P.S.   As an aside, is it intentional that the fall-back specifications are not proper prototypes? 

===

gas/
	* configure.in:  Check DECLS for free, getenv, malloc, realloc,
	stpcpy and strstr.
	* configure: Regenerate.
	* config.in: Likewise.
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