Fix i386-sse-stack-align.exp regression since GDB_PARALLEL.

gdb/testsuite/
2014-02-06  Jan Kratochvil  <jan.kratochvil@redhat.com>

	Fix i386-sse-stack-align.exp regression since GDB_PARALLEL.
	* gdb.arch/i386-sse-stack-align.exp: Use standard_output_file.
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