[committed] Fix ld-pe aligncomm tests vs. GCC-3

[Dave Korn]

    Hi all,

  As per the other day's discussion[*], gcc-3 used to call _alloca to align
the stack at the start of main().  Because these tests only need to link, not
run, a dummy definition will do fine, so this patch adds it.

  Tested on i686-pc-cygwin with gcc-3 and gcc-4.  Verified that it builds ok
with the addition on MinGW and arm-cegcc as well, although their standard
toolchains don't support the feature yet.

ld/testsuite/ChangeLog

	* ld-pe/aligncomm-1.c (_alloca):  Add dummy definition to
	satisfy final link on Windows targets when using gcc-3.
	* ld-pe/aligncomm-2.c (_alloca):  Likewise.
	* ld-pe/aligncomm-3.c (_alloca):  Likewise.
	* ld-pe/aligncomm-4.c (_alloca):  Likewise.

    cheers,
      DaveK
-- 
[*] - http://sourceware.org/ml/binutils/2009-05/msg00312.html and thread.

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