specfile: Add BuildArch: noarch

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
cct: Fix double call prefix and suffix.

in following:

@ def foo()
FOO
@ end
@
@ def bar()
{@ foo() @}
@ end

	{@ bar() @}

The prefix from the {@ bar() @} call has been replaced
by the {@ foo() @} call in bar().

The correct solution is to use a stack for prefixes and suffixes.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>